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• Socket 1155 vs 2011 vs Haswell

  - by woody

  The title says it all. I am trying to decide between sockets and just cant pinpoint which to get based on pros and cons. The build this will go into will be my primary PC. It will be used for every day computing, coding, some multimedia and gaming. I have read that 1155 and 2011 will be dead within the new year and that Haswell will double the performance of Ivy Bridge. What is a general run down on the different sockets? Pros and Cons? More specifically what are the technical differences between the three?

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• Do different operating systems have different read and write speeds?

  - by Ivan

  If I have two different operating systems, such as Windows 8 and Ubuntu, running on the same hardware, will the two operating systems have different read and write speeds? My guess is that there would be minimal difference between operating systems and read and write speeds to the hard disk since the major limited factor is seeking; however, different operating systems may use different file systems in order to attempt to reduce seek time in the hard disk. Likewise, I'm sure that modern operating systems will not actually write directly to the hard disk, and instead will just have it in memory and marked with a dirty bit. Are there any studies that show differences in read and write speeds between OSs? Or would the file system being used by the OS matter more than the OS itself?

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• What's the difference between keepalived and corosync, others?

  - by Matt

  I'm building a failover firewall for a server cluster and started looking at the various options. I'm more familiar with carp on freebsd, but need to use linux for this project. Searching google has produced several different projects, but no clear information about features they provide . CARP gave virtual interfaces that failover, I am not really clear on whether that's what corosync does, or is that what pacemaker does? On the other hand I did get manage to get keepalived working. However, I noted that corosync provides native support for infiniband. This would be useful for me. Perhaps someone could shed some light on the differences between: corosync keepalive pacemaker heartbeat Which product would be the best fit for router failover?

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• Any reason to prefer video adapter with two DVI ports versus one DVI/one VGA for DVI/VGA optional dual monitors?

  - by Bryce Thomas

  I am looking to buy a new video card to power two identical monitors. The monitors came with both DVI and VGA cables, so I am able to use either. My current video card has two DVI ports on the back, so I have both monitors connected via DVI at present. I have noticed that many modern video cards have a DVI/VGA/HDMI port trio and that cards with two DVI ports seem somewhat more scarce. Essentially, I have more options available to me for purchasing cards with a DVI/VGA/HDMI trio than with a DVI/DVI duo. My question is, are there any sound reasons to go to the extra effort of finding a card with two DVI ports versus simply running one of my monitors through a DVI and one through a VGA on a DVI/VGA/HDMI card? Quality differences? Any variety of image asymmetry? Configuration difficulties (I dual boot Windows and Ubuntu)? Anything else?

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• virt-viewer slower than virt-manager when viewing

  - by map7

  I've got a thin client server in which I have a few VM's for users under KVM which I manage through virt-manager. What I've noticed is if I start a VM guest on a thin client using the command 'virt-viewer ' then the guest is painfully slow to move around. However if on the same thin client I start the same guest VM through virt-manager it's fast. What are the differences here? Can I start a VM without having the user load up virt-manager and double click on their VM? Should I be looking at using splice in virt-viewer instead of VNC which is what I currently use?

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• Passwords and Keys in Linux

  - by PeanutsMonkey

  In a fit of desperation when I had my wireless connection die on me, I thought it was a problem with the key I had created at the start when I initially configured the wireless connection and hence deleted it. The option to create the key had presented itself when I created the wireless connection. It no longer asks me to. Now I am back online, do I have re-create the password and key I had before? If so, what do I choose and why? The options I have are as follows; PGP Stored password Password keyring Secure shell key The first and last option seem to be obvious and I have no idea about the differences between the second and third options. Why do I need a stored password or password keyring in all scenarios and not just the wireless issue I ran into? EDIT 0 Further to Belisama's comment, I have amended my question. EDIT 1 As requested, I have attached a screenshot

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• What's the difference between a wifi access point and station?

  - by Earlz

  I noticed that my (rooted) modem has some hidden modes for wifi. It has the default(and only setting without rooting) wireless access point, but it also has the settings repeater, ad-hoc, and station. What I'm really curious about is this station mode and how it differs from access point. I did a cursory search and didn't come up with any significant differences, other than that they are two distinct modes on many wireless chipsets. What is this station mode and how does it differ from access point?

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• Intel Core i7-4960HQ vs. 4850HQ (Haswell) [on hold]

  - by Timothy R. Butler

  I'm looking at the new MacBook Pros and trying to decide between the Core i7-4960HQ (2.6 GHz) and i7-4850 (2.3 GHz). I've found some synthetic benchmarks comparing them, but I haven't found a lot of data, so I'd appreciate any pointers to good comparisons for the Haswell family (especially these two processors). My cursory analysis seems to suggest there isn't a huge gain from the extra 300 MHz. I'd like to determine not only whether this is generally true, but also to figure out if the gains that are made in performance come at too high of cost. Is the 2.6 going to be pushing the limits of what can fit in a thin laptop without overheating? I've looked at some of Intel's documentation, but have not been able to determine what the normal and maximum operating temperature differences are for the models. In the past, there have been times that Intel's fastest models in a given range ran especially hot and/or consumed significantly more power compared to slightly slower models. Do those concerns factor into the current generation?

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• Macbook Pro 2.66 GHz vs. 2.8 GHz

  - by nevan

  Is there much advantage in getting the higher end Macbook Pro compared to the mid-range one? The differences between the two are: 2.66 GHz vs. 2.8 GHz 256 MB graphics memory vs. 512 MB 3 MB L2 cache vs. 6 MB 320 GB hard drive vs. 500 GB $2000 vs. $2300 I've looked around, but I can't find any direct comparisons for the two machines. I'd be using the machine for development. I generally use a computer for 3 years. I don't really play games, but do use Photoshop regularly. I've heard that once Snow Leopard arrives, the graphics chip will be used to boost the main processor, so I was wondering if getting the one with more graphics memory would be an advantage?

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• WYSIWYG editor for structured text (suitable for SVN versioning)

  - by chris_l

  I'm looking for an open source cross platform WYSIWYG editor that I can use to write documentation. I'm not looking for a web based solution - i.e. it should work without a web server, and I want to save my files directly to disk. The result could be any structured format, like Wiki markup, ReStructuredText, DocBook, or a small subset of HTML, ... But it's important, that Subversion diff can be used to see differences between the versions easily (this wouldn't work with .odt or .rtf files for example) I'm currently thinking about using Open Office, and saving the files as HTML, but is there a better solution?

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• How to access Guest (Linux) Filesystem from Host (Windows) in VirtualBox

  - by Dominic Barnes

  I am trying to synchronize my music between my desktop (Ubuntu 9.10) and my laptop (VirtualBox: Windows 7 host & Ubuntu 9.10 guest) I use Unison to perform the actual sync, which itself is not the problem. I am ultimately trying to get my Windows 7 host to be able to access the music files so I can sync my iPod Touch. What I need to figure out is how I can that to work. I would prefer to actually perform the sync to my Ubuntu Guest, mostly because of the filename allowed character differences between Windows and Linux. Is there a way to access the files on my Linux Guest from the Windows Host? Can I mount the VDI in Windows when VirtualBox is off? Can I have Windows Host access the Linux Guest filesystem while VirtualBox is running?

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• Why the huge difference between etch and lenny MySQL

  - by rmarimon

  I've been working on a program for the last year. The development environment is working with a database in MySQL running on debian etch version mysql Ver 14.12 Distrib 5.0.32, for pc-linux-gnu (i486) using readline 5.2. The production environment is working on debian lenny with version mysql Ver 14.12 Distrib 5.0.51a, for debian-linux-gnu (i486) using readline 5.2. I was just timing some database access and what takes in the development environment 150 seconds, takes 300 in the production environment. I checked the /etc/mysql/my.cnf files on both systems and the only differences are # development bind-address = 10.168.1.82 log_bin = /var/log/mysql/mysql-bin.log # production bind-address = 127.0.0.1 myisam-recover = BACKUP #log_bin = /var/log/mysql/mysql-bin.log I dump a database from the production and load it into the development and with the same server everything takes half the time !!! What should I check?

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• Finding out whether files are added, changed or deleted on a FTP server

  - by futureelite7

  I've recently been given the task to migrate about 200GB of data from one dedicated server to another. As this will take a week or more, I've been taking a snapshot of the current files on the FTP server using wget's mirror feature. However, since other users will probably be uploading / changing stuff in the meantime, the snapshot that I have made will not include the most recent changes. Since I only have access to FTP on this server, I'm planning to write a script that will recursively do a FTP stat on all files in the FTP folder, and compare the directory listing against the snapshot I have locally. If there are differences in the number of files, then I know files have been added or deleted. If the modification dates have been changed, then I know the files have been changed, and should redownload those files specifically. Am I missing anything in my approach, or are there any possible improvements to this approach?

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• Difference in VISUAL STUDIO VERSIONS

  - by karthik ram

  I would like to understand some fundamental VS version differences, What is the difference between Visual Studio 2008 and Visual Studio 2008 Team System? Does the Team System 2008 include VS2008, TFS 2008 & Team Explorer 2008? Furthermore, what is the difference betwene Team System 2008 and Team Suite 2008? I beleive there are no more Team Suites or Team Systems in 2010? Does Visual Studio Ultimate 2010 include all Team System components, like TFS 2010 & Team Explorer 2010, so in effect it is like an upgrade of Visual Studio 2008 Team System? Or does TFS 2010 & Team Explorer 2010 need to be installed separately?

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• NVIDIA same chipset, but different implementations - what is the difference?

  - by Horst Walter

  I have planned to buy a graphics card. When searching for a particular chipset (e.g. GTX 460) I find cards of different vendors (i.e. Gigabyte, Palit, PNY, ...). I can figure out differences in frequency, memory, and equipment. When I read test reports, usually a particular NVIDIA card is compared with its ATI/AMD "counterpart" - have not really found a comparison of all vendors for a particular NVIDIA chipset. So in order to make a decision: a) Are the drivers all the same for all the cards of a particular chipset (and provided by NVIDIA or the vendor?) b) How to figure out which card actually to buy. OK, I choose chipset, and memory, and check the card has the required ports, but then ....

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• Why does a website server recieve local files much slower than recieve files on other websites?

  - by T...

  The server at http://any2djvu.djvuzone.org receives same files from local computers much slower than from links on other websites (with the same files have been uploaded to the other websites, such as dropbox.com). The speed of uploading a file from local computers to other websites such as dropbox is also much faster than to any2djvu website. For example, a pdf file of 17MB needs more than 1 min to be uploaded to any2djvu server from a local computer with normal ISP such as Comcast High-speed internet, but takes less than 3 seconds from a dropbox link to any2djvu server, and takes around 10 seconds from the same local computer to dropbox. I wonder why there is such big differences for the speeds of different uploading ways to a web server? Thanks!

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• 10,000 RPM HDD (WD VelociRaptor) vs SSD for OS?

  - by GiH

  I currently have a 10,00RPM 150GB Raptor that I use for Vista. I'm about to upgrade to Windows 7, and while doing that I thought I'd buy another drive and install Ubuntu 9.10 on it. I don't want to partition the current drive I have, but I don't need 150GB for another OS. So, I'm having trouble deciding whether its worth it to buy a 64 GB SSD at the same price point as the 150GB WD VelociRaptor? Or should I just get a 7,200 RPM drive for really cheap (around $50)? Would it be better to use an SSD for the OS than a mechanical drive? I could always get a 32GB SSD too... Oh, and I don't want to virtualize Ubuntu because I'm going to be testing to see the differences in networking and overall performance.

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• Differing packages between Ubuntu 9.04 and 9.10

  - by bergyman

  So I've been playing around with VirtualBox and both of the above Ubuntu versions and I've noticed that there are some differences between the available packages when doing a apt-cache search <package>. Some of these I'm sure are obvious, as they potentially only work on their respective systems. But I've noticed specifically several ruby packages differ. So my question is whether or not there's a way to get some of the ruby packages (ruby1.9.1-full for example) which only seem to be available on 9.10 (yup, I did a sudo apt-get update on both 9.10 and 9.04) on my 9.04 system? Is there a way I can just do a kernel upgrade on 9.04, or whatever else may be needed in order to get at these more recent packages?

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• Disk full, du tells different. How to further investigate?

  - by initall

  I have a SCSI disk in a server (hardware Raid 1), 32G, ext3 filesytem. df tells me that the disk is 100% full. If I delete 1G this is correctly shown. However, if I run a du -h -x / then du tells me that only 12G are used (I use -x because of some Samba mounts). So my question is not about subtle differences between the du and df commands but about how I can find out what causes this huge difference? I rebooted the machine for a fsck that went w/out errors. Should I run badblocks? lsof shows me no open deleted files, lost+found is empty and there is no obvious warn/err/fail statement in the messages file. Feel free to ask for further details of the setup.

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• NFS or GFS for LVS 10 Server Setup

  - by Michael Robinson

  Currently we have a 10 servers LVS hosting setup. The people we hired to set it up did not anything about GFS which was our preferred Central Storage File System Solution. As we have tight time constraint, we just told them to use whatever they were familiar with which is NFS. I have since done some research and it seems that NFS is not ideal for the type of high traffic site we are hoping to build. I couldn't find much info online about the signaficance differences between the 2. As we to setup all servers again right now, should we stick with NFS or find someone who knows how to setup GFS amd go with that. We need a setup that is highly reliable and scalable as we intend. As after initial setup is done, we expect high increases in traffic and load.

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• Can not run ifconfig like commands via browser

  - by savruk

  Hi, Problem is I cannot run "ifconfig" or similar commands via browser. Environment: Programming language : python Server : lighttpd(CGI) , running on busybox. Well machine is really small and so I am really restricted. Tried techniques: chown every script to root. But there is no differences. Why? Because lighttpd runs under another user, I mean not under root. As it is not root, when I try to run script from browser it always calls the python file with its uid. So it makes it impossible to run "ifconfig eth0 192.168.2.123" like commands via web browser. I get "ifconfig: SIOCSIFADDR: Permission denied" error. What can I do? I do not have any sudoers file, so cannot modify sudo command. Well, I don't even have "sudo" command :) Thanks for your help

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• PHP5 without PHP4 compatibility

  - by Serty Oan

  This is the opposite question of this one. My purpose is that there is no need when you write only PHP5 code to have PHP4 compatibility. It is not helpful at all and due to differences between object models in those two version, it must be penalizing on interpreter performances (or am I wrong ?). So my questions are : is it possible to recompile PHP5 without retrocompatibility with PHP4 or to disable it in any other way to gain performances ? if it is not possible, is there a project somewhere which aim that goal ?

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• bash and arithmetic comparison: double quotes or not?

  - by Martin

  when comparing two integers in bash, do we have to put double quotes ? In the official document http://tldp.org/LDP/abs/html/comparison-ops.html I can read that double quotes should appear every time... But what is the differences in the following examples: [ "$VAR" -eq "1" ] [ $VAR -eq "1" ] [ "$VAR" -eq 1 ] [ $VAR -eq 1 ] As I am curious, a took a look at Ubuntu init scripts in /etc/init.d and there are many usage of arithmetic comparison in it, at least [ "$VAR" -eq "1" ] and [ $VAR -eq 1 ] are used... but it seems no one really "knows" what is the official way to do it. Thanks !

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• Can't rename/move files from OSX that were copied from NTFS

  - by 99miles

  Hello- I recently had data recovered and it was sent back to me on what I think is an NTFS drive. I copied all the files over to a file share I have on a Linux box, that's ext4. Now I have that share mounted on my OSX machine, and I can't move or rename most of the files. However, in a couple cases I was able to rename a folder after the third try. Another time I was able to rename a folder once, but not again. All the permissions are showing up the same on the command-line -- I can't see any differences between the permissions on any of the files/folders. Any clues??? Thanks.

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• Should I replace libapache2-mod-php5-filter with libapache2-mod-php5 on Debian 6 Apache 2.2.16?

  - by luison

  Upgrading various virtual machines we are having an issue with the Debian package upgrade to version 2.2.16 The upgrade (surprisingly) seems to remove libapache2-mod-php5 replacing it with libapache2-mod-php5-filter. This gave us some headache as the php.ini was pointing to the "old" one and some of the apache.conf conditional module rules stopped working. We can fix all those but we can't figure out if there would be any issues if we just "reversed" this and simply install libapache2-mod-php5 again and load that module instead of the "filter" one or in there is anyway to "alias" a module. I tend to think that the change "has a reason" but after reading apache2 and php5: module or filter I understand the module differences are to do with post delivery security issues.

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