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• BIOS upgrade lowers CPU temperature

  - by N.N.

  Setup I've got a system with an Asus P8Z68-V PRO motherboard and an Intel Core i7-2600K CPU running at stock speed (no overlocking) which I cool with a Noctua NH-U12P. On the heatsink I've got the two included fans connected via the included Low-Noise Adapters (L.N.A.) 1100 RPM, 16.9 dB(A). In the BIOS settings I've set the CPU and chassis fan profile to silent. Issue Yesterday I upgraded from BIOS version 0501 to 0606. After the upgrade I checked the temperatures in the BIOS monitor and was surprised to see that the CPU temperature was slightly ~30°C. Before the upgrade the CPU temperature was ~50°C with the same BIOS settings (see the following heading for details on temperatures). How can this be? It seems a bit odd that a BIOS upgrade can lower the CPU temperature by 20°C and it also seems odd that the CPU temperature is lower than the chassis temperature. Temperatures When I've checked temperatures the room temperature has been ~23°C. I haven't changed the placement of the computer nor the hardware or cooling setup between BIOS versions. BIOS version 0501 BIOS monitor: CPU: ~50°C Chassis: ~33°C I haven't got any temperature measures from lm-sensors or the like for version 0501 because I only discovered the issue after upgrading to version 0606 and the BIOS updater utility won't let me downgrade to version 0501 (it says "outdated image" when I try to load version 0501). BIOS version 0606 BIOS monitor: CPU: ~30°C Chassis: ~33°C lm-sensors in Ubuntu 11.04 Desktop 64-bit (sudo sensors after an uptime of 4 h 52 min and a load average of 0.22, 0.18, 0.15): coretemp-isa-0000 Adapter: ISA adapter Core 0: +32.0°C (high = +80.0°C, crit = +98.0°C) coretemp-isa-0001 Adapter: ISA adapter Core 1: +35.0°C (high = +80.0°C, crit = +98.0°C) coretemp-isa-0002 Adapter: ISA adapter Core 2: +29.0°C (high = +80.0°C, crit = +98.0°C) coretemp-isa-0003 Adapter: ISA adapter Core 3: +36.0°C (high = +80.0°C, crit = +98.0°C) The BIOS monitor temperatures was checked directly after the lm-sensors temperatures was checked. BIOS version 0706, 0801, 1101 and 3203 I get the same kind of temperatures both in the BIOS monitor and with lm-sensors in BIOS version 0706, 0801, 1101 and 3203 as in 0606. Information from Asus The 0606 changelog mentions nothing explicitly about CPU temperature (but item 3., as indicated by sidran32, might affect temperatures): P8Z68-V PRO 0606 BIOS with IRST 10.6.0.1002 Enable the support of Intel Rapid Storage Technology version 10.6.0.1002 Release Improve DRAM compatibility Improve System stability Improve compatibility with some Raid card model Increase IGD share memory size to 512MB However the following FAQ might give a hint: FAQs I find that the CPU temperature reading in BIOS is about 10~20 degrees centigrade hotter than the reading in OS. Is it normal? Page Tools Solution That is normal as BIOS does not send idle command to the CPU, making most of the power saving features useless. You should be getting similar reading if you disable EIST/C1E/CPU C3 Report/CPU C6 Report in BIOS.

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• CPU Temperature sensor wrong?

  - by Matias Nino

  Everest Ultimate is suddenly telling me that the CPU temperature (and core temps) for my E6850 Core 2 Duo is 72 degrees Celsius. When I stress-test the machine, the temp goes up to 91 degrees and the CPU actually throttles. System remains stable though. For over a year now, my CPU has run very cool (40's) with a large commercial copper heatsink/fan that I bought separately. To top it off, I removed the cover of the box and felt the cpu heatsink and it wasn't even warm. Is there such a thing as a CPU temp sensor showing the wrong readings? Any tips would help. UPDATE #1 Temp is also just as high in BIOS. So that leads me to believe it's a CPU seating issue (even though I used thermal paste to seat it two years ago when I built the machine) UPDATE #2 Well. I removed the heatsink and cleaned off the original thermal paste (which was somewhat crusty). I polished the surface, re-applied some new paste, and reseated the heat sink. After powering it up, there was no noticeable change in the temp - ideling at 74. Ran the stress test and it went up to 94 degrees before being 100% throttled. I let it sit at 94 degrees for 20 minutes straight and the computer didn't even flinch. I then immediately shut it off and opened the case and felt around. The heatsink was completely cold to the touch. Even the copper rods were cold. The area near contact with the CPU was slightly warm but not hot to touch. Then I ran REALTEMP, which is supposedly more accurate and it told me the CPU was at 104 degrees. (LOL) At this point, I'm thinking no doubt the cpu's sensor is wrong. Sidenote: the BIOS has the latest version so no option to flash there. Reverting hasn't been known to help from what I've read. What pisses me off is the false temps force the CPU to artificially throttle from 3GHz down to 2GHz and my CPU fan is cranking at full force all the time. Should I call intel and tell them to send me another E6850? SOLUTION UPDATE I switched the processor out with another one and got the same obscene temperatures with the new processor followed by a heatsink that was cool to touch. My suspicion in the heatsink was suddenly renewed. I swapped it out with the stock heatsink/fan and lo and behold the temperatures returned to the normal 35C-50C. Even though the thermal paste was visibly flattened out every time I removed it, it looks like the heatsink was still not pressing hard enough on the CPU to effectively conduct the heat. The heatsink is a Masscool 8Wa741, which screws into a standard position on a mount on the back of the MOBO. Only thing I can surmise after 2 years of use was that, over time, the heatsink pressure on the CPU gave way until the heat began to be ineffectively conducted. Lessons learned: Intel CPU's can run SUPER HOT (upwards of 95C) and still be stable. Heatsink's need to be VERY firmly pressed against the CPU to conduct heat.

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• Does Windows performance degrade past a certain level of CPU utilization?

  - by Mike Taylor

  Is there a recommended average CPU threshold in running Windows boxes based on experience in other shops? Background: We are running with Windows Server 2003 32-bit OS. Servers are handling a major enterprise-level web application suite with a high frequency of small transactions mixed in with much larger transactions - overall average is 13ms. Our average overall CPU utilization of the Windows servers are ~60% during prime-shift. And we question at what level does the Windows OS begin to shimmy on the CPU scheduling road? Thanks.

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• How to tell which process is hogging my CPU when they don't add up to 100%?

  - by endolith

  Ubuntu's System Monitor applet shows 100% CPU usage continuously. If I click it, the resources tab shows it at 100% continuously, too. If I go to processes, though, to find out which process is the culprit, there is nothing above 10%. If I run top there is nothing above 10%. The individual processes do not add up to 100%. I try killing lots of processes, but the overall usage continues to be 100%. How can I find out what's hogging the CPU? This is an unusual situation on a computer I use daily, which is never anywhere near 100% CPU unless I'm doing something that requires it (like loading 32 Firefox tabs), after which it goes back to a normal idle level. It's not a new install or anything. There is no reason the processor should be maxed out. I'm not sure when it started or if I changed something that caused it to happen. Normally I would use top or System Monitor and find the process that had gone out of control, but I can't find anything with those tools this time. It persists after reboots and everything. And the processor is obviously hot, so it's not an erroneous reading. Update: I tried killing every process, one at a time, until the problem went away, and killing vino-server finally fixed it, even though that process never went above 5%. I had enabled Remote Desktop a few days ago (and have obviously now disabled it). But the question remains: How did a single process manage to use 100% CPU while top only showed that process at 5%? How do I identify culprits like this in the future? Looks like I'm not the only one who's had this problem: Still a problem in both jaunty & karmic. Interestingly, both System Monitor & htop do not show the sum of individual processes being anywhere near 100% cpu.

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• SQL Server 2008 uses half the CPU’s

  - by ACALVETT

  I recently got my hands on a couple of 4 socket servers with Intel E7-4870's (10 cores per cpu) and with hyper threading enabled that gave me 80 logical CPU's. The server has Windows 2008 R2 SP1 along with SQL 2008 (Currently we can not deploy SQL 2008 R2 for the application being hosted). When SQL Server started I noticed only 2 NUMA nodes were configured and 40 logical cores where there should have been 4 NUMA nodes and 80 logical cores (see below). The problem is caused by that fact that...(read more)

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• Xorg constant high cpu usage

  - by user157342

  CPU AMD Athlon(tm) 64 X2 Dual Core Processor 4400+ Kernel 2.6.38-7.dmz.1-liquorix-amd64 X server version: X.Org X Server 1.9.0 OpenGL direct rendering: Yes OpenGL vendor: NVIDIA Corporation OpenGL renderer: GeForce 8400 GS/PCI/SSE2 OpenGL version: 3.3.0 NVIDIA 270.41.06 GCC version: 4.4.5 Java version: 1.6.0_20 Python version: 2.6.6 GTK version: 2.22.0 PyGTK version: 2.21.0 Firefox version: Mozilla Firefox 5.0 Ubuntu version: 10.10 GNOME version: 2.32.0 The issue is, the Xorg process always seems to be active with over 6% CPU and +50MB RAM usage, which in turn keeps the fans blowing all the time.

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• CPU temperature higher under Ubuntu 12.10 than under Windows 7

  - by user110019

  The CPU temperature under Ubuntu 12.10 is significantly higher than under Windows 7 doing similar tasks. For example, the CPU temperature under Windows when watching flash videos is around 50-60 degrees, under Ubuntu it is between 65-75. In idle mode in Ubuntu it is usually around 50. I use an i3 core and an integrated graphics. Is there a way to lower the temperature? And I don't mean via Jupiter as this doesn't work for watching videos..

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• CloudSeeder: CLR Stored Procedures For Creating CPU Pressure

  - by Adam Machanic

  Sometimes, in the interest of testing various scenarios that your server might encounter, it's useful to be able to quickly simulate some condition or another. I/O, memory, CPU pressure, and so on. This latter one is something I've been playing with a lot recently. CPU pressure in SQL Server creates all sorts of interesting side-effects , such as exacerbating waits and making various other conditions much easier to reproduce. In order to make this simpler, I've created the attached CLR library. This...(read more)

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• Ubuntu 14.04 Slow, High CPU Usage

  - by user273012

  I experienced CPU strange behavior after installing Ubuntu 14.04, at 5 or 10 minutes, CPU usage suddenly increased about 50%, that's really slow my laptop down (Ubuntu 13.10 worked fine by the way) Here is my laptop specs : ASUS A43SA Intel Core i3-2330M 2.20 GHz 4 GB of RAM I noticed this when the first installation, even after I disabled online and file search, even after I switch to GNOME 3, and even after I used GNOME Fallback Session, how to solve this?

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• Best Practices - Core allocation

  - by jsavit

  This post is one of a series of "best practices" notes for Oracle VM Server for SPARC (also called Logical Domains) Introduction SPARC T-series servers currently have up to 4 CPU sockets, each of which has up to 8 or (on SPARC T3) 16 CPU cores, while each CPU core has 8 threads, for a maximum of 512 dispatchable CPUs. The defining feature of Oracle VM Server for SPARC is that each domain is assigned CPU threads or cores for its exclusive use. This avoids the overhead of software-based time-slicing and emulation (or binary rewriting) of system state-changing privileged instructions used in traditional hypervisors. To create a domain, administrators specify either the number of CPU threads or cores that the domain will own, as well as its memory and I/O resources. When CPU resources are assigned at the individual thread level, the logical domains constraint manager attempts to assign threads from the same cores to a domain, and avoid "split core" situations where the same CPU core is used by multiple domains. Sometimes this is unavoidable, especially when domains are allocated and deallocated CPUs in small increments. Why split cores can matter Split core allocations can silenty reduce performance because multiple domains with different address spaces and memory contents are sharing the core's Level 1 cache (L1$). This is called false cache sharing since even identical memory addresses from different domains must point to different locations in RAM. The effect of this is increased contention for the cache, and higher memory latency for each domain using that core. The degree of performance impact can be widely variable. For applications with very small memory working sets, and with I/O bound or low-CPU utilization workloads, it may not matter at all: all machines wait for work at the same speed. If the domains have substantial workloads, or are critical to performance then this can have an important impact: This blog entry was inspired by a customer issue in which one CPU core was split among 3 domains, one of which was the control and service domain. The reported problem was increased I/O latency in guest domains, but the root cause might be higher latency servicing the I/O requests due to the control domain being slowed down. What to do about it Split core situations are easily avoided. In most cases the logical domain constraint manager will avoid it without any administrative action, but it can be entirely prevented by doing one of the several actions: Assign virtual CPUs in multiples of 8 - the number of threads per core. For example: ldm set-vcpu 8 mydomain or ldm add-vcpu 24 mydomain. Each domain will then be allocated on a core boundary. Use the whole core constraint when assigning CPU resources. This allocates CPUs in increments of entire cores instead of virtual CPU threads. The equivalent of the above commands would be ldm set-core 1 mydomain or ldm add-core 3 mydomain. Older syntax does the same thing by adding the -c flag to the add-vcpu, rm-vcpu and set-vcpu commands, but the new syntax is recommended. When whole core allocation is used an attempt to add cores to a domain fails if there aren't enough completely empty cores to satisfy the request. See https://blogs.oracle.com/sharakan/entry/oracle_vm_server_for_sparc4 for an excellent article on this topic by Eric Sharakan. Don't obsess: - if the workloads have minimal CPU requirements and don't need anywhere near a full CPU core, then don't worry about it. If you have low utilization workloads being consolidated from older machines onto a current T-series, then there's no need to worry about this or to assign an entire core to domains that will never use that much capacity. In any case, make sure the most important domains have their own CPU cores, in particular the control domain and any I/O or service domain, and of course any important guests. Summary Split core CPU allocation to domains can potentially have an impact on performance, but the logical domains manager tends to prevent this situation, and it can be completely and simply avoided by allocating virtual CPUs on core boundaries.

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• Insane CPU usage in QT 5.0

  - by GravityScore

  I'm having trouble using the QT framework, particularly with the paintEvent of QWidget. I have a QWidget set up, and am overriding the paintEvent of it. I need to render a bunch of rectangles (grid system), 51 by 19, leading to 969 rectangles being drawn. This is done in a for loop. Then I also need to draw an image on each on of these grids. The QWidget is added to a QMainWindow, which is shown. This works nicely, but it's using up 47% of CPU per window open! And I want to allow the user to open multiple windows like this, likey having 3-4 open at a time, which puts the CPU close to 150%. Why does this happen? Here is the paintEvent contents. The JNI calls don't cause the CPU usage, commenting them out doesn't lower it, but commenting out the p.fillRect and Renderer::renderString (which draws the image) lowers the CPU to about 5%. // Background QPainter p(this); p.fillRect(0, 0, this->width(), this->height(), QBrush(QColor(0, 0, 0))); // Lines for (int y = 0; y < Global::terminalHeight; y++) { // Line and color method ID jmethodID lineid = Manager::jenv->GetMethodID(this->javaClass, "getLine", "(I)Ljava/lang/String;"); error(); jmethodID colorid = Manager::jenv->GetMethodID(this->javaClass, "getColorLine", "(I)Ljava/lang/String;"); error(); // Values jstring jl = (jstring) Manager::jenv->CallObjectMethod(this->javaObject, lineid, jint(y)); error(); jstring cjl = (jstring) Manager::jenv->CallObjectMethod(this->javaObject, colorid, jint(y)); error(); // Convert to C values const char *l = Manager::jenv->GetStringUTFChars(jl, 0); const char *cl = Manager::jenv->GetStringUTFChars(cjl, 0); QString line = QString(l); QString color = QString(cl); // Render line for (int x = 0; x < Global::terminalWidth; x++) { QColor bg = Renderer::colorForHex(color.mid(x + color.length() / 2, 1)); // Cell location on widget int cellx = x * Global::cellWidth + Global::xoffset; int celly = y * Global::cellHeight + Global::yoffset; // Background p.fillRect(cellx, celly, Global::cellWidth, Global::cellHeight, QBrush(bg)); // String // Renders the image to the grid Renderer::renderString(p, tc, text, cellx, celly); } // Release Manager::jenv->ReleaseStringUTFChars(jl, l); Manager::jenv->ReleaseStringUTFChars(cjl, cl); }

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• Concurrent processes do not utilize all available CPU

  - by metdos

  I run some processes on an EC2 cc2.8xlarge instance which has 32 virtual processors. For some type of processes, when I run 16 processes on parallel, all of them use 100% of CPU cycles. But for other type of processes, they are not using 100% CPU and they finish considerably slower than a single thread. There is no time spend on IO and all data is served from memory. Do you have any idea about the reason of this problem?

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• Lower CPU % used by FFMPEG Process via PHP (FLV Video Conversion)

  - by BoRo

  Hi, Okay, so I currently execute an ffmpeg command via PHP to run a video conversion. The Problem I'm Having is during the conversion, the ffmpeg process(es) use up so much CPU/Processing Power (near 100%), which slows down the response of my webserver. Is there a Way (crontab or script) I can limit the ffmpeg processes to a certain CPU percentage? Thanks,

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• cpu use goes to 100% when I lock the screen

  - by gianni

  Whenever I lock the screen, after a certain amount of time, the cpu and the cpu fan use go up near the limit, and it returns back to normal the moment I unlock the screen again (as shown by psensor). How can I find out what process is responsible for this? I've tried with "top -S", and the result is this... PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2114 me 20 0 326m 104m 40m R 16 2.6 66:50.03 compiz 1234 root 20 0 396m 152m 98m R 6 3.8 20:23.88 Xorg 2204 me 20 0 160m 38m 30m S 4 1.0 0:33.35 yakuake 2446 me 20 0 206m 18m 12m S 4 0.5 6:32.18 psensor 2280 me 20 0 220m 18m 10m S 2 0.5 5:01.60 unity-panel 9138 me 20 0 154m 27m 15m S 2 0.7 0:03.63 plugin-cont 2282 me 20 0 65800 5272 3316 S 1 0.1 4:36.90 hud-service 2143 me 20 0 140m 11m 8352 S 1 0.3 2:50.16 indicator-m 9095 me 20 0 720m 253m 36m S 1 6.4 0:26.34 firefox 2076 me 20 0 7168 3484 828 S 1 0.1 1:46.53 dbus-daemon 2307 me 20 0 55000 5132 3632 S 1 0.1 2:01.55 indicator-a 2557 me 20 0 86328 6028 4576 S 0 0.1 1:44.71 conky 6290 me 20 0 2836 1296 964 R 0 0.0 0:29.64 top 6291 me 20 0 2836 1188 884 S 0 0.0 0:29.49 top 1 root 20 0 3644 1984 1284 S 0 0.0 60:57.76 init specs: ubuntu 12.04 fresh install intel core i5 4gB ram

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• ksoftirqd uses 100% cpu

  - by andy

  I am running 32bit Ubuntu 10.04. A lot of the times ksoftirqd/0 or ksoftirqd/1 start using up 100% CPU for no apparent reason, and I am forced to reboot my laptop. Incidentally this also happens when I maximize my (youtube) videos on Chrome and Fireox, but once I un-maximize the videos the CPU usage goes down to the original levels. Any ideas what it going on? --- Addendum --- dmesg produces a ~2000 line output. I searched for 'error' and 'warning' in the output, and here are the relevant lines (along with some headers): [ 0.000000] Initializing cgroup subsys cpuset [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Linux version 2.6.32-21-generic (buildd@yellow) (gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5) ) #32-Ubuntu SMP Fri Apr 16 08:09:38 UTC 2010 (Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2) [ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-2.6.32-21-generic root=UUID=157dcfda-acd6-4d1b-a6a8-ff9ccff61906 ro quiet splash [ 0.000000] KERNEL supported cpus: [ 0.000000] Intel GenuineIntel [ 0.000000] AMD AuthenticAMD [ 0.000000] Centaur CentaurHauls [ 0.000000] BIOS-provided physical RAM map: [ 24.775546] EXT3-fs warning: mounting fs with errors, running e2fsck is recommended [44920.210518] ata1: SError: { PHYRdyChg CommWake 10B8B Dispar LinkSeq TrStaTrns } [44920.210531] res 40/00:00:f0:4b:7f/00:00:18:00:00/40 Emask 0x10 (ATA bus error) [58673.134623] chrome[20101]: segfault at 7f38bc4ad000 ip 00007f38be769ecc sp 00007fff24616850 error 4 in libpepflashplayer.so[7f38bdc08000+e55000] [ 24.775546] EXT3-fs warning: mounting fs with errors, running e2fsck is recommended [44920.210531] res 40/00:00:f0:4b:7f/00:00:18:00:00/40 Emask 0x10 (ATA bus error)

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• Downclock CPU reaching critical temperature

  - by Draga

  I have an HP tx1250 laptop. It always had serious overheating problems and although usually it runs fine I'm now running a continuous test for my dissertation, this brings the CPU temp close to the critical and from time to time the computer shutdown for reaching it (checked the log). I use to have the same problem on Win XP but I noticed Win Vista and 7 downclock the CPU when is necessary to cool it down so I was thinking if the same is possible on Ubuntu 12. The only program I've found that may do the job is computer temp ( http://computertemp.berlios.de/ ) but it doesn't seems to work under Ubuntu 12. The inside of the laptop is fairly clean, the thermal paste is quite recent, I'm keeping it lifted from the desk and judjung by the sound of the fan that's running fine as well. The pc in now running between 78 and 91 degrees C but about once a day it shut down for reaching 95. I need the results of the test it's running pretty soon so it's important that it runs non-stop. I've though to set the maximum clock of the CPU to slightly less the maximum but then these tests I'm running would take much more time. Thanks! PS: first and last HP laptop for me.

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• Why ubuntu 12.04 Operating System too slow..?

  - by Sumit Singh

  I was using ubuntu 10.10 from last year. every thing was Ok with that. recently I've installed Ubuntu 12.04 in place of 10.10, after installing that on my Dell laptop, I started to feel uncomfortable. It to slow event if you move mouse then its feel like i'll take 1min to move one place 2 another.. I know why this is happening, all because of 12.04 runs my CPU up to 99%-100% all over time. And there are 2-3 processes who use all the cpu.. like 1. System_Monitor 2. compiz I don't know why its use all the CPU even Other app can't able to run .. in Ubuntu 10.10 every think was Ok.. Any solution for this problem..!! | Thank's

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• CPU fan kicks in to full gear when i try to install ubuntu 12.10 or LTS

  - by Remi cook

  Whenever I try to install (DUAL BOOT WITH WINDOWS 7) both versions of Ubuntu desktop on my PC the CPU fan starts spinning so fast that I couldn't even go through the installation for fear of my CPU exploding. In windows 7, the temp reaches 25-30 idle and 30-45 under full load. I tried installing through Wubi and by burning it to USB drive. Both wield the same results. I would appreciate any help. I'm a complete noob so take it easy one me. Intel Core i5 2500 @ 3.30GHz 4.00 GB Dual-Channel DDR3 @ 668MHz (9-9-9-24) Motherboard ASUSTeK Computer INC. P8Z68-V LX (LGA1155) Graphics AMD Radeon HD 6850 (Sapphire/PCPartner)

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• CPU Architecture and floating-point math

  - by Jo-Herman Haugholt

  I'm trying to wrap my head around some details about how floating point math is performed on the CPU, trying to better understand what data types to use etc. I think I have a fairly good understanding of how integer math is performed. If I've understood correctly, and disregarding SIMD, a 32-bit CPU will generally perform integer math at at least 32-bit precision etc. Is it correct that floating-point math is dependent on the presence of a FPU? And that the FPU on the x86 is 80-bit, so floating point math is performed at this precision unless using SIMD? What about ARM?

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• Analyze Drupal and Wordpress sites CPU load in shared server

  - by Tedi

  Our hosting company is complaining that both our Drupal and Wordpress websites running in a shared server are consuming too many CPU resources. The traffic for each site is not more than 100 users per day and, at a first glance, we don't have very many plugins/add-ons. Is there any tool or resource to analyse what is causing that high CPU load? Thanks Update: We decided to suspend our accounts while the problem was being debugged but still our hosting (Site5) said that they saw unacceptable activity on our sites so we had to move to a dedicated server... asked them several times to provide us with more information and they always came back saying that we had to purchase a higher account. Finally decided to move to another hosting service.

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• Working with CPU cycles in Gameboy Advance

  - by Preston Sexton

  I am working on an GBA emulator and stuck at implementing CPU cycles. I just know the basic knowledge about it, each instruction of ARM and THUMB mode as each different set of cycles for each instructions. Currently I am simply saying every ARM instructions cost 4 cycles and THUMB instructions cost 2 cycles. But how do you implement it like the CPU documentation says? Does instruction cycles vary depending on which section of the memory it's currently accessing to? http://nocash.emubase.de/gbatek.htm#cpuinstructioncycletimes According to the above specification, it says different memory areas have different waitstates but I don't know what it exactly mean. Furthermore, what are Non-sequential cycle, Sequential cycle, Internal Cycle, Coprocessor Cycle for? I saw in some GBA source code that they are using PC to figure out how many cycles each instruction takes to complete, but how are they doing it?

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• MacBookPro 7,1 can only see one cpu

  - by gozzilli

  On a MacBookPro 7,1 running ubuntu 11.10, System monitor only sees 1 core (instead of 2). cat /proc/cpuinfo | grep 'cpu cores' also gives: cpu cores : 1 I followed this guide and added acpi_apic_instance=2 to the line with GRUB_CMDLINE_LINUX_DEFAULT, but that doesn't seem to change the situation. What can I do? I'm using rEFIt, installed under MacOS, and running in dual boot with MacOS. After the rEFIT menu, I'm still presented with the GRUB menu (I'm assuming that's normal). I saw similar posts on this matter, but could not fix my problem with what they suggested. EDIT: With the method mentioned above the computer runs sometimes with 1 core and other times with 2. Why is that? How can it be fixed?

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• ubuntu 11.10 on MacBookPro 7,1 can only see one cpu

  - by gozzilli

  On a MacBookPro 7,1 running ubuntu 11.10, System monitor only sees 1 core (instead of 2). cat /proc/cpuinfo | grep 'cpu cores' also gives: cpu cores : 1 I followed this guide and added acpi_apic_instance=2 to the line with GRUB_CMDLINE_LINUX_DEFAULT, but that doesn't seem to change the situation. What can I do? I'm using rEFIt, installed under MacOS, and running in dual boot with MacOS. After the rEFIT menu, I'm still presented with the GRUB menu (I'm assuming that's normal). I saw similar posts on this matter, but could not fix my problem with what they suggested. Any help appreciated. Thanks!

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• Is this CPU usage normal for Xorg?

  - by Samuaz

  I checked System Monitor to see if the frequency of my CPU increases without doing anything and saw that xorg is always using 10-40% of the CPU even if it's not doing much of anything on the desktop or simply surfing the Internet. Is this normal? If not, how can I fix it? I have: a Macbook white 4,1 Core2 Duo running at 2.10 GHz GPU Intel GMA X3100 4GB of RAM Ubuntu 11.04 I am running Unity and I do not have many effects enabled. I have only activated Compiz animations, scale, desktop, some shadows...

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• Second CPU missing of Dual Core

  - by Zardoz

  My Lenovo T61 has a dual core CPU. I just noticed that under Ubuntu 10.10 only one CPU is recognized. I know that once both CPUs worked. Not sure since when the second CPU is missing. Maybe since the last kernel update. Currently I am using linux-image-2.6.35-23-generic (for x86_64). What can I do to enable the second CPU again? Here the ouput of /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Duo CPU T8100 @ 2.10GHz stepping : 6 cpu MHz : 800.000 cache size : 3072 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm ida dts tpr_shadow vnmi flexpriority bogomips : 4189.99 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: Any help is welcome. I really need that CPU power for my work here.

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