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• Does ZFS cache Compressed or Uncompressed data in a ZFS file-system with compression turned on?

  - by George Bailey

  ZFS supports file-system compression and it also caches frequently or recently accessed data. If a system has lots of CPU but the underlying data storage system is slow. It is possible that ZFS would perform better with compression turned on. This can be easily tested when writing files by measuring CPU and disk usage and throughput. (of course latency may exist,, but this would not be an issue for large files). But what about cache? If data will have to be decompressed every time it is read then this is probably less of a good idea. Is the cached data compressed?. Does anybody have some information on this?

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• Chipset GPU causes a massive slowdown

  - by zyboxenterprises

  My AMD Radeon HD 7700 recently broke (fan stopped working and GPU overheated), and now I'm running on internal chipset graphics, and it causes a massive slowdown of the whole PC. I've changed the graphics memory from 32MB (minimum) to 256MB (highest), and it hasn't made any difference whatsoever. I'm using Windows Aero, and disabling it should have made a small difference, but it didn't; the whole PC is still slow. I know that it's not the computer build, because I built it myself, and it was a lot faster when it had the AMD Radeon HD 7700 in it, which is the reason why I believe it's the internal chipset graphics that are causing the problem. Is this behavior normal? I don't have the cash right now to go out and buy a new dedicated GPU. I'm using an ASRock N68C-GS FX motherboard with an AMD FX 4100 (overclocked to 4.3GHZ), with 4GB RAM. The overclock was an attempt to resolve this issue, and it isn't related to this issue that the integrated graphics is causing a slowdown.

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• Avoid cache overflow in Atempo LiveBackup

  - by Vebjorn Ljosa

  When attempting the initial backup of a new client, Atempo LiveBackup seems to require a very large cache. For instance, a 20 GB cache is not enough to back up a computer that has 100 GB of data. It appears that LiveBackup is adding new files to the cache at a faster rate than it can send them to the server. When the cache fills up, the backup fails. Aside from removing most data from the computer and then add them back gradually after the initial backup, is there a good workaround? Is it possible to make LiveBackup slow down its scan so as to not fill the cache? Or is it possible to place the cache on an external drive?

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• 10 System LAN latency with ADSL modem as gateway

  - by itsoft3g

  Recently I expanded LAN in my office from 3 to 10 computers. Structure star topology, one ADSL Modem connected to One Switch which is again connected to 10 computers. Also we have Wifi device Netgear which is connected from switch. ADSL Modem acts as the DHCP Server, all the system will have default gateway IP (ADSL Modem's IP) Network latency is now become very high, All the chat severs disconnect often like google talk, skype etc, also internet become very very slow. when all the computer turned on. We have 4 Mbps Download and 100 Kbps upload Net speed. Its look like ADSL Modem cannot able to handle all the connections. I tried to setup a system as default gateway which will connect to modem, not sure how to do this. Please advice on this.

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• How to set up a PC which can be booted from Linux AND Windows?

  - by Martin

  Our PC was running Windows XP up to know. It has become incredibly slow and I'm considering switching to Linux (Ubuntu?!) as a fresh OS. However, there are some applications we rarely use which run only on Windows and I also want to have the possibility to easily go back to the old system, if I should find during testing linux, that anything is missing or not available. So the idea is to install Linux on a new (second) hard drive and use the existing Windows XP from a virtual machine (converted by Paragon Drive Backup) in the transition time. We have a lot of data on the PC, tens of GBs of Photos (managed by Picasa), ... My questions: What could be the best way to setup the new hard drive? (Partitions) I assume that I can not access the Linux data from Windows but I could access (read/write) windows drives from Linux? Does anyone know good tutorials for this use case? What other things might I have to consider for transition Windows-Linux?

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• Active Directory Profile Slows down machine

  - by boburob

  I have a strange issue with an Active Directory profile. When the user logs onto a machine with his profile, the whole machine becomes incredibly slow and unresponsive, with programs hanging and taking an age to load everything. If I log into the same machine with any other profile nothing happens. I took a look at his original profile, any start up programs, login scripts, etc and could not see what could be causing this. The machine is not running out of memory or CPU. Nothing strange is appearing in the event log and I can see nothing running under his profile which may cause this. So I created the user a new profile to test this on and exactly the same thing happens on the first login. The only thing which would of been carried across is the security groups the user is assigned to, yet I have other users with the same groups who do not experience these issues so I am now at a complete loss on where to go next!

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• What is the best filesystem for storing thousands of files in one dictionary-like id-blob structure?

  - by Ivan

  What filesystem best suits my needs? Thousands or even millions of files in one directory. Good (ext4 & ntfs level or close) reliability (incl. fault tolerance) and access speed. No directories actually needed, as well as descriptive names, just a dictionary-like structure of id-blob pairs is all I need. No links, attributes, and access control features needed. The purpose is a file storage where all the metadata (data describing all the facts about what the file actually contains and who can access it) is stored in a MySQL database. As far as I know common filesystems like NTFS and ext3/4 can go dead-slow if there are too many files placed in one directory - that's why I ask.

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• users connecting to remote desktop to use software

  - by Jordan

  Im an IT assistant at a CNC milling company and we use a program called made2manage. Its an ERP (enterprise resource management) software. Each license is something like 5k and instead of giving each employee there own copy of the software he has everyone that uses the program connect to a server that has a copy of m2m on it. Its slow when there are a bunch of people connected to it. But I guess they dont want to buy more licenses. Is there a better way to do something like this? How bad of a practice is this?

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• Firefox (on windows) constantly consuming 10% CPU - is there an add-in to find the rogue tab?

  - by tbone

  I often have many Firefox windows open, each with many tabs. Now and then one of the tabs will be running a web page that for some reason consumes lots of resources. Right now, I have a tab somewhere that is constantly consuming 10% of the CPU...which would be fine as my computer can easily handle that (see specs below...all other apps are responsive), but it seems to slow Firefox down....everything, everywhere is extremely laggy in Firefox, I can see pauses while I type this. Is there: - a way I can isolate separate instances (or even tabs) in FF into a separate process, so one rogue tab doesn't bog down FF across the entire system? - maybe an add-in that can either identify tabs consuming lots of CPU, or maybe a way to "shut down" activity on tabs you haven't used in a while? Firefox 3.6.10 Windows 7 Ultimate 64 i7 920 @ 3.6 GHz 12 GB Ram

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• Site-to-site VPN

  - by ronadona

  We are a small business company that is based in Sydney and opened a new office in London. Number of employees in Sydney office is 25 and in London is 6 employees. So the traffic isn't that high. Files to be transferred are Excel sheets with size of 15mb max. Both locations have MS server 2008 and Fortigate gateways. I set up a site to site vpn but it's extremely slow. Maybe this is because our upload speeds is 1Mbps only but We will increase the upload speed to 20 Mbps in both locations but I am afraid that this will not solve the problem as the 2 locations are far from each other and the upload upgrade won't solve the problem. what's the best way to go? Shall we find a provider for the VPN? or is there another technology that can be used through internet without paying extra costs? Many thanks!

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• xinet vs iptables for port forwarding performance

  - by jamie.mccrindle

  I have a requirement to run a Java based web server on port 80. The options are: Web proxy (apache, nginx etc.) xinet iptables setuid The baseline would be running the app using setuid but I'd prefer not to for security reasons. Apache is too slow and nginx doesn't support keep-alives so new connections are made for every proxied request. xinet is easy to set up but creates a new process for every request which I've seen cause problems in a high performance environment. The last option is port forwarding with iptables but I have no experience of how fast it is. Of course, the ideal solution would be to do this on a dedicated hardware firewall / load balancer but that's not an option at present.

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• Huge HDD response time in Resource monitor

  - by Mille

  Just bought all parts for a computer and put it together and installed a fresh version of windows 7. After a while, when using the computer it gets very slow, and even closing down windows can take several minutes. I started to look in the resource monitor and though I found the answer watching my hdd. The thing is that the hdd completes all tests in Seagate's SeaTools for Windows successfully. Which makes me doubt on the problem and weather I can send it in to get an replacement. Suggestions on what it could be and what I can do about it? Here a screenshoot from the resource monitor:

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• Monitoring User Login time

  - by beakersoft

  Hi, i have recently been given the task of trying to work out why the login time (not machine boot time) for some of our users seems slow. The vast majority of clients (95%) are running on XP sp3, Windows 2003 domain controlers. Most users have the same model of machine. I would like to be able to see how long each of the polices are taking to load (if possable split user and computer) and any other info that might help (services starting etc) I changed the userenvdebuglevel reg option to generate the userenv.log file but it did'nt contain very much info Thanks Luke

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• How do I split an internet connection into 4 equal connections?

  - by luis velasco

  My 4 roomates and I have a problem: One of my roomies is downloading torrents all the time. When somebody need make a call or doing something like you tube or a quiz using the internet conection. The internet is very slow.... I can not create a network using a computer as a proxy. I just need a good router (and in the budget no more than $50).. I just want to split a 16MB connection into a separated 4 x 4 mb (theoretically)..

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• Is Windows Server 2003 on 96 MB possible?

  - by Nifle

  I have an old laptop, a Pentium II with 96 MB. I have had Windows 2000 on it for ages, it was slow but usable. But now I have to upgrade since I can't get my USB-wlan drivers to install (the old PCMCIA network card broke). I would prefer to install Windows XP but I have no spare licence, but I do have a Windows Server 2003 licence. Do you think it's possible (and usable) to squeeze in 2003 on this computer? Edit: Unfortunately 2003 simply refuses to install on the laptop. It hangs with an error message (paraphrased) 2003 has detected a problem with your computer and has halted the installation to prevent damage. And then some error codes This happens very early in the installation while it's copying the installation files just after I accepted the licence. So I give up for now.

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• Copy large files to multiple machines on a LAN

  - by Jonathan Callen

  I have a few large files that I need to copy from one Linux machine to about 20 other Linux machines, all on the same LAN as quickly as is feasible. What tools/methods would be best for copying these files, noting that this is not going to be a one-time copy. These machines will never be connected to the Internet, and security is not an issue. Update: The reason for my asking this is because (as I understand it) we are currently using scp in serial to copy the files to each of the machines and I have been informed that this is "too slow" and a faster alternative is being sought. According to what I have been told, attempting to parallelize the scp calls simply slows it down further due to hard drive seeks.

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• Compiling/executing Java on Sublime Text 2 works fine except that it cannot read user input

  - by meiryo

  I am a student learning Java and I want to compile and run some simple Java on ST2. Also Eclipse is very slow on my laptop. Here is my JavaC.sublime-build file so far: { "cmd": ["sublimejavaexec.bat", "$file"], "file_regex": "^(...*?):([0-9]*):?([0-9]*)", "selector": "source.java" } So far it can run code that does not require user input. However when I have something that uses the Java input scanner it either skips through or generates an error. Can anyone suggest a solution such as a plug-in or if ST2 actually has this kind of feature on its console? Thanks.

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• How do I lower idle cpu usage in ubuntu linux? Gnome or KDE Variants

  - by Jasen

  My question comes from a kde desktop currently, but it also happens with the gnome instance. When just sitting there, with only the cpu monitor widget running. no open windows, no background processes other than the desktop, my cpu is at ~20%. I wanna know how to fix this, and possibly get better performance out of it. When running my windows side, the cpu will sit at zero, and i generally load new programs about 400ms faster. With windows 7 being as slow as it is, this is not acceptable. and the widget is only set to check every 500ms, so im almost completely sure its not the widget. My system is a Gateway nv 53 amd 2.0 ghz turion with 4 gb of installed ram, and 500 gb hd. both linux and windows are 64 bit. average ram use on either system is about 1.4 gb for just the os

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• How do I analyze an Apache Bench result?

  - by Alan Hoffmeister

  I need some help with analyzing a log from Apache Bench: Benchmarking texteli.com (be patient) Completed 100 requests Completed 200 requests Completed 300 requests Completed 400 requests Completed 500 requests Completed 600 requests Completed 700 requests Completed 800 requests Completed 900 requests Completed 1000 requests Finished 1000 requests Server Software: Server Hostname: texteli.com Server Port: 80 Document Path: /4f84b59c557eb79321000dfa Document Length: 13400 bytes Concurrency Level: 200 Time taken for tests: 37.030 seconds Complete requests: 1000 Failed requests: 0 Write errors: 0 Total transferred: 13524000 bytes HTML transferred: 13400000 bytes Requests per second: 27.01 [#/sec] (mean) Time per request: 7406.024 [ms] (mean) Time per request: 37.030 [ms] (mean, across all concurrent requests) Transfer rate: 356.66 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 27 37 19.5 34 319 Processing: 80 6273 1673.7 6907 8987 Waiting: 47 3436 2085.2 3345 8856 Total: 115 6310 1675.8 6940 9022 Percentage of the requests served within a certain time (ms) 50% 6940 66% 6968 75% 6988 80% 7007 90% 7025 95% 7078 98% 8410 99% 8876 100% 9022 (longest request) What this results can tell me? Isn't 27 rps too slow?

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• Video problem with Windows 7 Games

  - by Jordan 1GT

  I have a Dell xps M1330 which originally ran Vista, but I upgraded to Windows 7. When I try to run a Win 7 game like spider solitaire I receive the following message: "The game is running in software rendering mode. Hardware acceleration is either disabled or not supported by your video card driver which could slow down game performance. Make sure you have the latest video card driver installed and that hardware acceleration is turned on." I confirmed that hardware acceleration is turned on. When I go to Dell's site, I'm told there is no later video driver. When I run the game it runs very choppy. I wouldn't care, but I loaded a .pptx file which is doing strange things in normal view and I suspect may be related to the same video problem. Any ideas?

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• Enumerating network shares with NetBIOS

  - by Karrax

  Hello, I have a case where I need to find all connectable shares on my network, and preferably as much information about the share possible. I could do this manually but its quite a big network and it would be too slow. If I did it manually Im guessing I would do something like net view net use //hostname <browse it manually> This would however not give me hidden shares so its not a viable option. Does anyone know of a tool which can help me out in this case? I already tried Sysinternals ShareEnum but it did not work properly. It did a half decent job, but it gave me access denied on tons of shares that was actually open. Any tips in how I can script this is also appriciated. Thank you

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• Terminal Server 2003 Performance Troubleshooting

  - by MikeM

  Let me get your thoughts on terminal server performance problems. The server hosts average 25 users which, after running some numbers, on average use 600MB memory with their main applications running (web browser, adobe reader, IP phone client). All users are on the same LAN as server. We constantly experience slow response and short session lockups. Combined CPU usage is on average 10%. What appears strange to me is that the system shows 29GB physical memory with 25GB of it free. The page file usage is about 50% averaging 9GB used. Some server specs OS: Server 2003 32bit Enterprise with /PAE flag RAM: 32GB CPU: 2xQuad Core @ 2.27Ghz HD: RAID5 1.2GB After doing basic troubleshooting using performance monitor it leads me to believe that the performance problems are caused by the 32bit OS limitation in addressing full 32GB of physical memory even though the /PAE flag is used. Can anyone suggest something, troubleshooting steps that can lead to a more conclusive answer? Thanks

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• alternatives to roboform

  - by ldigas

  Yes, I know there is already a few similar questions. Is there an alternative to RoboForm (which for some reason makes my FF very slow, because of some other extensions) which has the same way of working. What I mean, you click on ... and it opens a new tab with the page in question, and logs on to it (so no databases, and such ...). One other advantage would be if it kept passwords locally. Basically, I'm looking for RoboForm other than RoboForm. Anyone knows of any ?

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• Is a computer's DRAM size not as important once we get a Solid State Drive?

  - by Jian Lin

  I am thinking of getting a Dell X11 netbook, and it can go up to 8GB of DRAM, together with a 256GB Solid State Drive. So in that case, it can handle quite a bit of Virtual PC running Linux, and Win XP, etc. But is the 8GB of RAM not so important any more? Won't 2GB or 4GB be quite good if a Solid State Drive is used? I think the most worrying thing is that the memory is not enough and the less often used data is swapped to the pagefile on hard disk and it will become really slow, but with an SSD drive, the problem is a lot less of a concern? Is there a comparison as to, if DRAM speed is n, then SSD drive speed is how many n and hard disk speed is how many n just as a ball park comparison?

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• Let task explorer always run with realtime priority

  - by Simon Verbeke

  I have replaced task manager by process explorer from sysinternals. I would like this to always run at realtime, so that I can easily get it open when my system is really slow. I have noticed that it can take a while to start this program at those moments. I have gone over the different options mentioned on SU. I can't change the shortcut, it immediately opens the .exe. I also can't use the task manager plugins/extensions, as I'm not using task manager. Any idea what I could do? Preferably without installing any other software. That is, if the priority would have any effect on starting the program.

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