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  • Poor performance of single processor 32bit Windows XP xompared SMP in VBA+Excel

    - by Adam Ryczkowski
    Welcome! On many computers I experienced poor performance of 32 bit guests running on 64 bit Linux host (I used only the Debian family). At last I managed to collect benchmark data. I made the benchmark by running custom VBA macro, (which we use in our company) that generates 284 pages long Word document full of Excel Pie charts, tables and comments. The macro is run as a single task (excluding the standard services) on a set of identically configured Windows XP 32-bit systems. I measured the time (in sec.) needed to perform the test. The computer (i.e. my notebook Asus P53E) supports both VT-d extensions and native Windows XP. It has 2-core processor, each core is hyperthreaded, so in total we have 4 mostly independent execution units. I use the latest VirtualBox 4.2 and VMWare Workstation 9.0 for Linux, installed together on the same host (running Mint 13 Maya) but never run simultaneously. The results (in column Time) are no less accurate than ± 10% Here are the results (sorry for the format, but I couldn't find out a better solution for tables in SO): +---------------+-------------+------------------------------------------------------+---------+------------+----------------+------+ | Host software | # processor | Windows kernel | IO APIC | VT-x/AMD-V | 2D Video Accel | Time | +---------------+-------------+------------------------------------------------------+---------+------------+----------------+------+ | VirtualBox | 1 | Advanced Configuration and Power Interface (ACPI) PC | 0 | 1 | 0 | 1139 | | VirtualBox | 1 | Advanced Configuration and Power Interface (ACPI) PC | 0 | 1 | 1 | 1050 | | VirtualBox | 1 | Advanced Configuration and Power Interface (ACPI) PC | 0 | 0 | 1 | 1644 | | VirtualBox | 4 | ACPI Multiprocessor PC | 1 | 1 | 1 | 6809 | | VMWare | 1 | ACPI Uniprocessor PC | | 1 | 1 | 1175 | | VMWare | 4 | ACPI Multiprocessor PC | | 1 | 1 | 3412 | | Native | 4 | ACPI Multiprocessor PC | | | | 1693 | | Native | 1 | Advanced Configuration and Power Interface (ACPI) PC | | | | 1170 | +---------------+-------------+------------------------------------------------------+---------+------------+----------------+------+ Here are the striking conclusions: Although I've read in the VirtualBox fora about abysmal performance with 32-bit guest on 64-bit host, VMWare also has problems compared to native run, still being twice faster(!) than VBox. Although VBA is inherently single-threaded, the Excel calculations, which take much more than a half of total computation time, supposedly aren't. So one would expect some speed gain when running on 2+ cores ("+" for hyperthreading). What we see is a speed loss. And quite big one too. For the VirtualBox the VT-d extension isn't a big deal. Can anyone shed some light on why the singlethreaded Windows kernel is so much faster than the SMP one?

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  • What happened to my EEE PC keyboard?

    - by etheros
    I was using my EEE PC 1000H running Windows XP and out of the blue, the keyboard stopped working - pressing keys does absolutely nothing. It does not appear to be a hardware issue, as I am able to enter BIOS configuration with no issues. I've tried: 'Safe mode' 'Last known good configuration' Reinstalling the generic keyboard driver Removing all power sources and holding down the power button, as suggested by popular forums. What could the problem be, and what could I try?

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  • Is U.P.S necessary to have for PC?

    - by Jitendra vyas
    otherwise can my PC component ( Monitor, Motherboard, RAM, HDD, CPU, SMPS) get damage dues to suddenly power gone and come and due to power fluctuation. or it's only needed to shut down windows Properly. Can i face both Hardware and Software problems without UPS?

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  • 4 month old 500 GB SATA HDD making noise?

    - by metal gear solid
    My 4 month old 500 GB SATA HDD making noise sometimes and the PC hangs when it makes noise when the noise stops desktop work fine. It doesn't happen every day but it does happen. Is something wrong with HDD, Data, power cable, or my cabinet's power supply? Should I run scandisk or defragmentation on the disk.

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  • how to setup kismet.conf on Ubuntu

    - by Registered User
    I installed Kismet on my Ubuntu 10.04 machine as apt-get install kismet every thing seems to work fine. but when I launch it I see following error kismet Launching kismet_server: //usr/bin/kismet_server Suid priv-dropping disabled. This may not be secure. No specific sources given to be enabled, all will be enabled. Non-RFMon VAPs will be destroyed on multi-vap interfaces (ie, madwifi-ng) Enabling channel hopping. Enabling channel splitting. NOTICE: Disabling channel hopping, no enabled sources are able to change channel. Source 0 (addme): Opening none source interface none... FATAL: Please configure at least one packet source. Kismet will not function if no packet sources are defined in kismet.conf or on the command line. Please read the README for more information about configuring Kismet. Kismet exiting. Done. I followed this guide http://www.ubuntugeek.com/kismet-an-802-11-wireless-network-detector-sniffer-and-intrusion-detection-system.html#more-1776 how ever in kismet.conf I am not clear with following line source=none,none,addme as to what should I change this to. lspci -vnn shows 0c:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g [14e4:4315] (rev 01) Subsystem: Dell Device [1028:000c] Flags: bus master, fast devsel, latency 0, IRQ 17 Memory at f69fc000 (64-bit, non-prefetchable) [size=16K] Capabilities: [40] Power Management version 3 Capabilities: [58] Vendor Specific Information <?> Capabilities: [e8] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable- Capabilities: [d0] Express Endpoint, MSI 00 Capabilities: [100] Advanced Error Reporting <?> Capabilities: [13c] Virtual Channel <?> Capabilities: [160] Device Serial Number Capabilities: [16c] Power Budgeting <?> Kernel driver in use: wl Kernel modules: wl, ssb and iwconfig shows lo no wireless extensions. eth0 no wireless extensions. eth1 IEEE 802.11bg ESSID:"WIKUCD" Mode:Managed Frequency:2.462 GHz Access Point: <00:43:92:21:H5:09> Bit Rate=11 Mb/s Tx-Power:24 dBm Retry min limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Managementmode:All packets received Link Quality=1/5 Signal level=-81 dBm Noise level=-90 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:169 Invalid misc:0 Missed beacon:0 So what should I be putting in place of source=none,none,addme with output I mentioned above ?

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  • Problems with Startup after Script runs to Shutdown Windows 7 PC

    - by Toby Allen
    I have a simple .bat script to shutdown a kiosk style machine in our work shutdown -h -f this hibernates the machine and I have it running each evening as a scheduled job. However my problem comes when I turn the machine on again. The first time I press power it starts up and then immediately hibernates again, like it runs the script a second time. the second time I press power it stays up. Any suggestions on how I can avoid this?

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  • Software to hold battery at 50% charge level

    - by Mehper C. Palavuzlar
    My Sony Vaio laptop has a built-in program called "Sony Battery Care" which provides a functionality to hold battery at certain levels of charge while operating. For example, I've set it to 50% and the battery is always kept at that level while on AC power. This mode prevents battery degradation and is more effective as I usually use my laptop with AC power. I'm looking for a similar program to use with other laptops with Windows OS; preferably a free one.

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  • Can Amazon VMs be used as Active Directory domain controllers?

    - by mrdenny
    I've got a client who wants to move his companies servers off site. As he is only a 10 person company I'm looking for some pretty in-expensive options. One option is the smallest of the Amazon cloud machines. The question becomes can I make one of these machines a domain controller? Cost wise the Amazon machine is cheaper than the power costs of keeping a server (or a PC) up and running in his home office 24x7 thanks to the high cost of power in Southern California.

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  • After my laptop wakes up from sleeping/hibernating, the LCD/brightness is very low. How can I set it to default?

    - by meder
    In Power Management Preferences, On AC Power tab, I have brightness to 100%. "Dim display when idle" is not checked. I know for sure my LCD brightness is capable of going higher, because if I hit Fn and F7 then it resets the monitor brightness and settings for a few seconds, but the resolution breaks and then the brightness goes back. PS: OS is Debian Lenny ( I set the tags but for clarification ) and laptop is a Thinkpad.

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  • Safely reboot prior to recovering data

    - by ELO
    What is the safest (without additional writing to the disk) way to power down computer whose deleted files you want to recover in order to boot from rescue medium? In case of a desktop computer, plugging off the power cord looks like the most direct solution, but are there possible side-effects, apart from losing unsaved data? More problematic seems the laptop, with removing the battery being the equivalent, but is it a good idea overall?

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  • VLAN issues between linux kernels 2.6 / 3.3 in an ESX / Cisco environment

    - by David Griffith
    I shall attempt to explain an issue I have encountered - I have a VM running on esx 4.1 with an interface connected to VLAN800 via an access port on a cisco 3750. It runs linux - kernel 2.6.24, and has about 5 to 10 Mbit of chatter on 10.10.0.0/16 and various multicast addresses to look after. I needed to isolate certain devices from certain other devices on the network, with all of them having to talk to that one VM. No, the address space can't be separated, nor can the networks be easily vlan'd apart. The software on the VM listens to one interface only. Private vlans appear to be the way to go. So as a test, I built a bridge on the VM that globs together the vlans as needed. All good, everything works as expected. But occasionally (sigh) there's some latency that trips up a couple of profinet devices on the network because, you know, you're not really supposed to trunk real-time protocols around the place willy-nilly. I shift it to our test/backup server - works nicely, but I don't want it to be running on the test server as we muck around with that a lot. So I says to myself, "I'll put it on a new VM for testing and tweaking." I download a small linux distro with kernel 3.3, and install as a new VM with a the vlans as separate interfaces for testing. I power up the testing VM - ok. I bring up all the separate interfaces - ok. I can ping the production VM, see all sorts of traffic going past with tshark, etc. I build a bridge and put the primary vlan on it - the production VM running 2.6 immediately loses its multicast traffic - Unicast is fine. (?) I shut down the bridge - still no multicast traffic (!?) I power-cycle the production VM(!?!?) - multicast traffic returns. I trunk everything into the testing VM and create vlan interfaces under linux instead - same result, as soon as I start the bridge.... no multicast on the production VM. Ok, so I take a break and leave things alone. I decide to play with a couple of ubiquiti bullet radios - I'm testing various firmware as a side project. I flash a radio with Open-wrt-12.09. I enable a trunk on a port on a cisco on our network so I can muck around with multiple vlans and SSIDs I power up the radio and connect - ok. I create a vlan interface from the trunk.... the same vlan as the production VM wayyyyy over there, three cisco routers away. Ok. I bridge the vlan interface to the wifi interface and immediately get a phone call. The production VM has (suprise!) lost its multicast traffic. Again, nothing comes back until I power-cycle the VM. What the hell is going on?

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  • USB devices don't work after restoring from Stand By

    - by Steve
    Hi. I'm running Windows XP SP3 on a NEC Versa L1100 laptop. If I wake my laptop up from Stand By, no attached USB devices will function. Device Manager shows all USB entries to be working properly. There is an option to "Allow the computer to turn off this device to save power" in the Power Management properties of USB entries. Is this causing the issue or something else? I have the latest drivers for my motherboard installed.

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  • Building a backup server

    - by user8181
    One of my older motherboards broke and I'm planning to use the remaining power supply, hard drive and case to build a backup server. I want to buy a new motherboard and CPU that can be used 24x7 and wont break down in a few months. So the question is, do you have any recommendations on any reliable motherboards and CPU for a backup server? Processing power is not a huge issue.

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  • Computer not turning off after windows shuts down printer driver

    - by Confused
    The power is not shutting off my computer after windows shuts down. Windows shuts down and I hear my computer case "click" but the power and fans all stay on. This seemed to start after I installed the canon pixma printer driver and software from their website. I have uninstalled the printer software from "uninstall program" and deleted the printer from printers. I have even stopped spool service and deleted printer following this post, the printer drivers did uninstall. How to completely remove printer from Windows 7

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  • Finding a cause of shutdown/sleep

    - by user1188570
    My server running is Linux 3.2.0-4-amd64 #1 SMP Debian 3.2.54-2 x86_64 GNU/Linux. About once a day, sometimes once every two days is shut down - It isn't really shut down, it seems like its sleeping - Power button is blinking, but I cannot boot it by clicking on power or reset button, I must pull electricity out and plug it back in, then I can boot it. What could be the cause of this? How can I fix this?

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  • Is data=journal on a separate device on Ext4 as good as using a RAID controller with battery backed cache for file system consistency?

    - by Jeff Strunk
    It seems to me that data=journal prevents file system inconsistency in the case of power failure. Using it with a dedicated journal device mitigates the performance penalty of writing the data twice. A power outage would still lose the data that is currently being written to the journal, but the file system on disk would always be consistent. If that amount of loss is acceptable, is a RAID controller with battery backed cache really worthwhile?

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  • Stop the screen saver and hibernation temporarily in VB.Net

    - by Tim Santeford
    I have a very long running syncronization task that cannot be interrupted by the screen saver or aggressive power saving modes. I want to make a single api call to stop power save mode and then restore it once the task is done. The following code is peaced together from various other posts but it has no effect on XP's power management settings. What am I doing wrong? TIA! Private Declare Function SetThreadExecutionState Lib "kernel32" (ByVal esFlags As Long) As Long Public Enum EXECUTION_STATE As Integer ES_CONTINUOUS = &H80000000 ES_DISPLAY_REQUIRED = &H2 ES_SYSTEM_REQUIRED = &H1 ES_AWAYMODE_REQUIRED = &H40 End Enum Public Shared Sub PowerSaveOff() SetThreadExecutionState(EXECUTION_STATE.ES_DISPLAY_REQUIRED Or EXECUTION_STATE.ES_CONTINUOUS) End Sub Public Shared Sub PowerSaveOn() SetThreadExecutionState(EXECUTION_STATE.ES_CONTINUOUS) End Sub Here are the systems screensaver and powermode settings:

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  • Emulator batteryService not working

    - by user568551
    So i've got a 1.6 emulator running. I have a receiver with action power connected and disconnected filters. when i connect to the emulator through telnet and issue the power ac on or power ac off command, logcat shows: 01-11 21:33:01.096: ERROR/BatteryService(67): Could not open '/sys/class/power_supply/usb/online' 01-11 21:33:01.104: ERROR/BatteryService(67): Could not open '/sys/class/power_supply/battery/batt_vol' 01-11 21:33:01.104: ERROR/BatteryService(67): Could not open '/sys/class/power_supply/battery/batt_temp' and my receiver does not get activated. It was working just fine yesterday and now it does not. I tried reinstalling the AVD, and also deleted and reinstalled the SDK from the SDK manager. Works fine in my 2.2 emulator. Any ideas?

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  • SQL Server Editions and Integration Services

    The SQL Server 2005 and SQL Server 2008 product family has quite a few editions now, so what does this mean for SQL Server Integration Services? Starting from the bottom we have the free edition known as Express, and the entry level Workgroup edition, as well as the new Web edition. None of these three include the full SSIS product, but they do all include the SQL Server Import and Export Wizard, with access to basic data sources but nothing more, so for simple loading and extraction of data this should suffice. You will not be able to build packages though, this is just a one shot deal aimed at using the wizard on an ad-hoc basis. To get the full power of Integration Services you need to start with Standard edition. This includes the BI Development Studio, for building your own packages, and fully functional IDE integrated into Visual Studio. (You get the full VS 2005/2008 IDE with the product). All core functions will be available but with a restricted set of transformations and tasks. The SQL Server 2005 Features Comparison or Features Supported by the Editions of SQL Server 2008 describes standard edition as having basic transforms, compared to Enterprise which includes the advanced transforms. I think basic is a little harsh considering the power you get with Standard, but the advanced covers the truly ground-breaking capabilities of data mining, text mining and cleansing or fuzzy transforms. The power of performing these operations within your ETL pipeline should not be underestimated, but not all processes will require these capabilities, so it seems like a reasonable delineation. Thankfully there are no feature limitations or artificial governors within Standard compared to Enterprise. The same control flow and data flow engines underpin both editions, with the same configuration and deployment options allowing you to work seamlessly between environments and editions if using the common components. In fact there are no govenors at all in SSIS, so whilst the SQL Database engine is limited to 4 CPUs in Standard edition, SSIS is only limited by the base operating system. The advanced transforms only available with Enterprise edition: Data Mining Training Destination Data Mining Query Component Fuzzy Grouping Fuzzy Lookup Term Extraction Term Lookup Dimension Processing Destination Partition Processing Destination The advanced tasks only available with Enterprise edition: Data Mining Query Task So in summary, if you want SQL Server Integration Services, you need SQL Server Standard edition, and for the more advanced tasks and transforms you need SQL Server Enterprise edition. To recap, the answer to the often asked question is no, SQL Server Integration Services is not available in SQL Server Express or Workgroup editions.

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  • 6 Interesting Facts About NASA’s Mars Rover ‘Curiosity’

    - by Gopinath
    Humans quest for exploring the surrounding planets to see whether we can live there or not is taking new shape today. NASA’s Mars probing robot, Curiosity, blasted off today on its 9 months journey to reach Mars and explore it for the possibilities of life there. Scientist says that Curiosity is one most advanced rover ever launched to probe life on other planets. Here is the launch video and some analysis by a news reporter Lets look at the 6 interesting facts about the mission 1. It’s as big as a car Curiosity is the biggest ever rover ever launched by NASA to probe life on outer planets. It’s as big as a car and almost double the size of its predecessor rover Spirit. The length of Curiosity is around 9 feet 10 inches(3 meters), width is 9 feet 1 inch (2.8 meters) and height is 7 feet (2.1 meters). 2. Powered by Plutonium – Lasts 24×7 for 23 months The earlier missions of NASA to explore Mars are powered by Solar power and that hindered capabilities of the rovers to move around when the Sun is hiding. Due to dependency of Sun the earlier rovers were not able to traverse the places where there is no Sun light. Curiosity on the other hand is equipped with a radioisotope power system that generates electricity from the heat emitted by plutonium’s radioactive decay. The plutonium weighs around 10 pounds and can generate power required for operating the rover close to 23 weeks. The best part of the new power system is, Curiosity can roam around in darkness, light and all year around. 3. Rocket powered backpack for a science fiction style landing The Curiosity is so heavy that NASA could not use parachute and balloons to air-drop the rover on the surface of Mars like it’s previous missions. They are trying out a new science fiction style air-dropping mechanism that is similar to sky crane heavy-lift helicopter. The landing of the rover begins first with entry into the Mars atmosphere protected by a heat shield. At about 6 miles to the surface, the heat shield is jettisoned and a parachute is deployed to glide the rover smoothly. When the rover touches 3 miles above the surface, the parachute is jettisoned and the eight motors rocket backpack is used for a smooth and impact free landing as shown in the image. Here is an animation created by NASA on the landing sequence. If you are interested in getting more detailed information about the landing process check this landing sequence picture available on NASA website 4. Equipped with Star Wars style laser gun Hollywood movie directors and novelist always imagined aliens coming to earth with spaceships full of laser guns and blasting the objects which comes on their way. With Curiosity the equations are going to change. It has a powerful laser gun equipped in one of it’s arms to beam laser on rocks to vaporize them. This is not part of any assault mission Curiosity is expected to carry out, the laser gun is will be used to carry out experiments to detect life and understand nature. 5. Most sophisticated laboratory powered by 10 instruments Around 10 state of art instruments are part of Curiosity rover and the these 10 instruments form a most advanced rover based lab ever built by NASA. There are instruments to cut through rocks to examine them and other instruments will search for organic compounds. Mounted cameras can study targets from a distance, arm mounted instruments can study the targets they touch. Microscopic lens attached to the arm can see and magnify tiny objects as tiny as 12.5 micro meters. 6. Rover Carrying 1.24 million names etched on silicon Early June 2009 NASA launched a campaign called “Send Your Name to Mars” and around 1.24 million people registered their names through NASA’s website. All those 1.24 million names are etched on Silicon chips mounted onto Curiosity’s deck. If you had registered your name in the campaign may be your name is going to reach Mars soon. Curiosity On Web If you wish to follow the mission here are few links to help you NASA’s Curiosity Web Page Follow Curiosity on Facebook Follow @MarsCuriosity on Twitter Artistic Gallery Image of Mars Rover Curiosity A printable sheet of Curiosity Mission [pdf] Images credit: NASA This article titled,6 Interesting Facts About NASA’s Mars Rover ‘Curiosity’, was originally published at Tech Dreams. Grab our rss feed or fan us on Facebook to get updates from us.

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  • How To Make NVIDIA’s Optimus Work on Linux

    - by Chris Hoffman
    Many new laptops come with NVIDIA’s Optimus technology – the laptop includes both a discrete NVIDIA GPU for gaming power and an onboard Intel GPU for power savings. The notebook switches between the two when necessary. However, this isn’t yet well-supported on Linux. Linus Torvalds had some choice words for NVIDIA regarding Optimus not working on Linux, and NVIDIA is now currently working on official support. However, if you have a laptop with Optimus support, you don’t have to wait for NVIDIA — you can use the Bumblebee project’s solution to enable Optimus on Linux today. Image Credit: Jemimus on Flickr How To Create a Customized Windows 7 Installation Disc With Integrated Updates How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using?

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