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  • Linux Scheduling Mechanism in 2.6.22?

    - by Mazen
    Hello, I'm doing some kind of performance evaluation using two different vanilla Linux kernels, 2.6.22 and 2.6.31, since I assume each of them uses a different scheduling mechanism: 2.6.22 uses the old O(1) scheduler, whilst 2.6.31 adopts the CFS. Could anybody confirm the correction of this assumption?

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  • Ubuntu with KDE and kernel 3.6.2 - performance issues

    - by Pelda
    I have recently swiched to Ubuntu and installed KDe on it. I like software included in Ubuntu but interface from Kubuntu. My problem is, that after installation of kernel 3.6.2 (deafult ubuntu 12.04 is 3.2 I think) - whole KDE interface is laggy and I have to render using Xrended because Opel AL doesnt work. So please tell me - I didint find it anywhere - Does KDE has some problems with new kernel? should i downgrade back to 3.x.x? Thank you for answers and your time. Pelda

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  • La première beta de Ubuntu 10.04 LTS est sortie : nouveau design, nouveau kernel, nouveaux logiciels

    La beta 1 de Ubuntu 10.04 LTS est sortie Nouveau design, nouveau kernel, nouveaux logiciels Fini le marron dans Ubuntu. Le choc est rude, certes. Mais la première beta de la mouture 10.04 de l'OS consolera les nostalgique de l'ancien design de la distribution Linux (certainement) la plus connue au monde. Bien qu'il ne s'agisse que de la première beta, Lucid Lynx propose en effet déjà plusieurs nouveautés majeures. Sous le capot, on trouve par exemple le kernel 2.6.32 de Linux, Gnome 2.30 et une prise en charge améliorée des cartes graphiques NVIDIA. Coté logiciel, Ubuntu 10.04 propose notamment OpenOffice.org 3.2.0 (la suite bureautique de Su...

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  • Proprietary Driver missing after Kernel upgrade

    - by Chris
    I recently upgraded my kernel to the Linux 3.4 kernel. Upon doing so, I found that it zapped my proprietary driver for my graphics card. As an alternative, I had saved Catalyst 12.8, but now it will not open through Software Center. I tried several other terminal methods, but it seems that many of these postings are bunk. They only work until you're almost done and then you get errors. I just need a little help from somebody who has been there, as I am new to Ubuntu. I'm kind of afraid to reboot because this is my 3rd full load of Ubuntu. Any ideas?

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  • Computer crashed during 3.0.0.17-generic kernel upgrade

    - by Z Swim
    My computer crashed (due to heat) during the update process for the 3.0.0.17-generic kernel upgrade. My computer will not boot ant all in 3.0.0.17 now and 3.0.0.16 is unstable (wireless networking doesn't work, also crashes often). I found the boot to previous versions tool at start up and the last stable version is 3.0.0.15-generic. However, my computer still thinks that it has 3.0.0.16-generic and 3.0.0.17-generic, even though both of these versions are broken. Is there anyway to force a reinstall of the 3.0.0.16-generic and 3.0.0.17-generic kernel updates from 3.0.0.15 and associated other updates?. (Without having to do a full reinstall?) I am running ubuntu 11.10. Thanks!

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  • Newly compiled (patched with -ck) 3.3 kernel won't boot up

    - by Shiki
    Screen is garbled. Reaaaally garbled. Like some sort of scrambling image from a movie. I can upload some pictures if needed. To be short with the description. Here is my 3.3 + ck .config file: http://pastebin.com/aP2F9RcH The dmesg log of the failed kernel: http://pastebin.com/esc2Rtka The computer is a ThinkPad T500 laptop. I have selected everything needed for the computer (as far as I can tell, but check the .config). The normal generic Ubuntu kernel boots and works perfect!

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  • After Upgrading to 12.04 the Kernel won't Initiate

    - by Jeff
    I had 11.10 and tried to upgrade recently, via the installer pop-up reminder. Afterwards it would not boot, citing an issue with the kernel. So I've setup a 12.04 installation USB, which appears to work fine. The problem is it doesn't provide an upgrade option, just format and install or install alongside the current broken kernel. I believe I should be able to still get the information from the broken OS after installing alongside, but if there is a way to fix this more directly that would be preferable.

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  • Ubuntu 12.04 PXELINUX does not boot RHEL Kernel and Initrd

    - by utpal
    I have successfully setup PXE server on Ubuntu 12.04 with DNSMASQ for DHCP Proxy Service, TFTPD-HPA for TFTP service, NFS-KERNEL-SERVER, APACHE2 and SYSLINUX for pxelinux.0 bootloaded needed for pxe boot using the following POST: http://ubuntuforums.org/showthread.php?t=1606910 I was successfully able to pxe boot a client to a Ubuntu 12.04 LIVE CD. Next, I want to PXE boot a client to a RHEL 6.5 x64 Kernel and initrd image. I dont want to install, just boot a client so that it mounts initrd and I can get a minimal filesystem on the client. How can I do that? Please Help!!

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  • Upgrade from 10.04 to 11.04, must maintain minimum kernel 2.6.38

    - by Steve
    I have a machine running 10.04 and am using BTRFS with lzo compression. I upgraded the kernel to 2.6.38 to enable this (using a PPA). I have my /home folder on a separate (4 TB) BTRFS drive. / is on ext4. My only complaint with this setup is that it uses the old BTRFS tools. How can I upgrade first to 10.10, then 11.04 as required, when 10.10 uses 2.6.35? I don't want it to crash/choke on mounting /home. Will it just let me keep booting the newer kernel I have while upgrading?

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  • Random process hangs after clean install

    - by Toshe
    After installing fresh Kubuntu 11.04 Natty on my desktop PC, I experienced some issues with application and process hangs. There is also a problem with my USB 3 hard disk. These sort of problems did not happen on Kubuntu 10.10 installed on the same PC (on separate partition). The hangs manifest themselves with kernel log messages like these: [ 960.480151] INFO: task amarok:2505 blocked for more than 120 seconds. [ 960.480153] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 960.480155] amarok D 0000000000000000 0 2505 1 0x00000000 [ 960.480158] ffff8800a556bb38 0000000000000086 ffff8800a556bfd8 ffff8800a556a000 [ 960.480162] 0000000000013d00 ffff8800cb7f3178 ffff8800a556bfd8 0000000000013d00 [ 960.480165] ffffffff81a0b020 ffff8800cb7f2dc0 ffffea000242ac58 ffff88012704c870 [ 960.480169] Call Trace: [ 960.480172] [<ffffffff815c19f7>] __mutex_lock_slowpath+0xf7/0x180 [ 960.480175] [<ffffffff815c144b>] mutex_lock+0x2b/0x50 [ 960.480180] [<ffffffffa0d0ad42>] video_open+0x102/0x400 [cx8800] [ 960.480183] [<ffffffff815c2cbe>] ? _raw_spin_lock+0xe/0x20 [ 960.480186] [<ffffffff8117c55d>] ? __d_lookup+0x10d/0x170 [ 960.480191] [<ffffffffa0ca0731>] v4l2_open+0x101/0x130 [videodev] [ 960.480194] [<ffffffff81168f4a>] chrdev_open+0xda/0x1f0 [ 960.480197] [<ffffffff81168e70>] ? chrdev_open+0x0/0x1f0 [ 960.480200] [<ffffffff81162cee>] __dentry_open+0xce/0x2f0 [ 960.480202] [<ffffffff8116ef33>] ? generic_permission+0x23/0xc0 [ 960.480205] [<ffffffff811641e1>] nameidata_to_filp+0x71/0x80 [ 960.480208] [<ffffffff811733c8>] finish_open+0xc8/0x1b0 [ 960.480210] [<ffffffff811725b7>] ? do_path_lookup+0x87/0x160 [ 960.480213] [<ffffffff81173b88>] do_filp_open+0x2c8/0x7c0 [ 960.480216] [<ffffffff81172902>] ? user_path_at+0x62/0xa0 [ 960.480219] [<ffffffff81131d4d>] ? handle_mm_fault+0x16d/0x250 [ 960.480222] [<ffffffff812e6c47>] ? __strncpy_from_user+0x27/0x60 [ 960.480225] [<ffffffff81180ea7>] ? alloc_fd+0xf7/0x150 [ 960.480228] [<ffffffff8116425a>] do_sys_open+0x6a/0x150 [ 960.480230] [<ffffffff81164360>] sys_open+0x20/0x30 [ 960.480233] [<ffffffff8100c002>] system_call_fastpath+0x16/0x1b [ 1080.480027] INFO: task knotify4:1663 blocked for more than 120 seconds. [ 1080.480030] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1080.480032] knotify4 D 0000000000000000 0 1663 1 0x00000000 [ 1080.480036] ffff880123a2bb28 0000000000000082 ffff880123a2bfd8 ffff880123a2a000 [ 1080.480040] 0000000000013d00 ffff880121003178 ffff880123a2bfd8 0000000000013d00 [ 1080.480044] ffff8800cb7e16e0 ffff880121002dc0 ffffffff81060a27 ffff88012704c870 [ 1080.480048] Call Trace: [ 1080.480054] [<ffffffff81060a27>] ? mutex_spin_on_owner+0x97/0xd0 [ 1080.480059] [<ffffffff815c19f7>] __mutex_lock_slowpath+0xf7/0x180 [ 1080.480069] [<ffffffff812e4f61>] ? vsnprintf+0x221/0x620 [ 1080.480072] [<ffffffff815c144b>] mutex_lock+0x2b/0x50 [ 1080.480076] [<ffffffffa0b2d10f>] cx8802_request_acquire+0x5f/0xf0 [cx8802] [ 1080.480081] [<ffffffffa0e87e08>] mpeg_open+0x78/0x270 [cx88_blackbird] [ 1080.480084] [<ffffffff8117c55d>] ? __d_lookup+0x10d/0x170 [ 1080.480092] [<ffffffffa0ca0731>] v4l2_open+0x101/0x130 [videodev] [ 1080.480096] [<ffffffff81168f4a>] chrdev_open+0xda/0x1f0 [ 1080.480099] [<ffffffff81168e70>] ? chrdev_open+0x0/0x1f0 [ 1080.480102] [<ffffffff81162cee>] __dentry_open+0xce/0x2f0 [ 1080.480105] [<ffffffff8116ef33>] ? generic_permission+0x23/0xc0 [ 1080.480108] [<ffffffff811641e1>] nameidata_to_filp+0x71/0x80 [ 1080.480111] [<ffffffff811733c8>] finish_open+0xc8/0x1b0 [ 1080.480113] [<ffffffff811725b7>] ? do_path_lookup+0x87/0x160 [ 1080.480116] [<ffffffff81173b88>] do_filp_open+0x2c8/0x7c0 [ 1080.480119] [<ffffffff81172902>] ? user_path_at+0x62/0xa0 [ 1080.480122] [<ffffffff811663f1>] ? get_empty_filp+0xa1/0x170 [ 1080.480125] [<ffffffff812e6c47>] ? __strncpy_from_user+0x27/0x60 [ 1080.480128] [<ffffffff81180ea7>] ? alloc_fd+0xf7/0x150 [ 1080.480131] [<ffffffff8116425a>] do_sys_open+0x6a/0x150 [ 1080.480134] [<ffffffff81164360>] sys_open+0x20/0x30 [ 1080.480137] [<ffffffff8100c002>] system_call_fastpath+0x16/0x1b [ 1080.480147] INFO: task dolphin:1842 blocked for more than 120 seconds. [ 1080.480148] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1080.480150] dolphin D 0000000000000000 0 1842 1 0x00000004 [ 1080.480154] ffff8800cb4f3b38 0000000000000082 ffff8800cb4f3fd8 ffff8800cb4f2000 [ 1080.480157] 0000000000013d00 ffff8800cb7f4858 ffff8800cb4f3fd8 0000000000013d00 [ 1080.480161] ffffffff81a0b020 ffff8800cb7f44a0 ffffea000267b0d0 ffff88012704c870 [ 1080.480164] Call Trace: [ 1080.480168] [<ffffffff815c19f7>] __mutex_lock_slowpath+0xf7/0x180 [ 1080.480171] [<ffffffff815c144b>] mutex_lock+0x2b/0x50 [ 1080.480176] [<ffffffffa0d0ad42>] video_open+0x102/0x400 [cx8800] [ 1080.480179] [<ffffffff815c2cbe>] ? _raw_spin_lock+0xe/0x20 [ 1080.480181] [<ffffffff8117c55d>] ? __d_lookup+0x10d/0x170 [ 1080.480186] [<ffffffffa0ca0731>] v4l2_open+0x101/0x130 [videodev] [ 1080.480190] [<ffffffff81168f4a>] chrdev_open+0xda/0x1f0 [ 1080.480192] [<ffffffff81168e70>] ? chrdev_open+0x0/0x1f0 [ 1080.480195] [<ffffffff81162cee>] __dentry_open+0xce/0x2f0 [ 1080.480198] [<ffffffff8116ef33>] ? generic_permission+0x23/0xc0 [ 1080.480200] [<ffffffff811641e1>] nameidata_to_filp+0x71/0x80 [ 1080.480203] [<ffffffff811733c8>] finish_open+0xc8/0x1b0 [ 1080.480206] [<ffffffff811725b7>] ? do_path_lookup+0x87/0x160 [ 1080.480208] [<ffffffff81173b88>] do_filp_open+0x2c8/0x7c0 [ 1080.480211] [<ffffffff81172902>] ? user_path_at+0x62/0xa0 [ 1080.480214] [<ffffffff81131d4d>] ? handle_mm_fault+0x16d/0x250 [ 1080.480217] [<ffffffff812e6c47>] ? __strncpy_from_user+0x27/0x60 [ 1080.480220] [<ffffffff81180ea7>] ? alloc_fd+0xf7/0x150 [ 1080.480223] [<ffffffff8116425a>] do_sys_open+0x6a/0x150 [ 1080.480225] [<ffffffff81164360>] sys_open+0x20/0x30 [ 1080.480228] [<ffffffff8100c002>] system_call_fastpath+0x16/0x1b Attempts to kill the hung process are unsuccessful: root@deskpc:~# ps -ef |grep amarok myuser 2505 1 0 10:47 ? 00:00:00 /usr/bin/amarok root 2747 2020 0 11:06 pts/3 00:00:00 grep --color=auto amarok root@deskpc:~# kill -9 2505 root@deskpc:~# ps -ef |grep amarok myuser 2505 1 0 10:47 ? 00:00:00 /usr/bin/amarok root 2749 2020 0 11:06 pts/3 00:00:00 grep --color=auto amarok root@deskpc:~# kill -9 2505 root@deskpc:~# ps -ef |grep amarok myuser 2505 1 0 10:47 ? 00:00:00 /usr/bin/amarok root 2751 2020 0 11:06 pts/3 00:00:00 grep --color=auto amarok root@deskpc:~# When trying to access my external USB3 disk, the following kernel message is observed: [ 2169.330012] xhci_hcd 0000:06:00.0: Timeout while waiting for a slot [ 2169.330018] hub 3-0:1.0: couldn't allocate port 1 usb_device I am not sure the two problems (application hangs and USB3 timeouts are related) but they do not happen under Kubuntu 10.10. Judging by the dmesg messages, it looks to me that this is a kernel (or potentially kernel driver) problem, but not sure how to debug it. Any ideas? I ran apport-bug, but it advised me to post a question here first. Shall I report the issue on the official K/Ubuntu bugzilla?

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  • VMware Player 5.0 or VMware Workstation 9.0 after upgrade to Ubuntu 12.10

    The upgrade process Upgrading Ubuntu 12.04 to latest version 12.10 - aka Quantal Quetzal - is straight forward and you only need to follow the offical upgrade instructions. Short version on the console looks like this: sudo do-release-upgrade This will update the repository entries, and start the upgrade process. After some minutes or hours of download and installation, you have to reboot your system once to get the new kernel loaded. As time of writing, I'm on '3.5.0-17-generic'. And as with any modification of the kernel version, you have to compile the necessary kernel modules to get VMware Player or Workstation up and running. Usually, this happens the first time you try start your VMware software and that's it. Well, again not so this time. Getting the kernel patch Luckily, the community over VMware is very active and you can get a new kernel patch in the online forums here. Get the download and put in a folder have write permissions. Then you extract the archive on the console like so: tar -xjvf vmware9_kernel35_patch.tar.bz2 Then you change into the newly created folder: cd vmware9_kernel3.5_patch/ And you execute the available shell script as root (superuser) like so: sudo ./patch-modules_3.5.0.sh This will stop any running instances of VMware software, patches the source files and runs the compile process for your active environment. This might take some time depending on your machine, and once completed you can start VMware Player or Workstation as previously. In case that you are going to apply the patch again, the script will simply quit with the following output: /usr/lib/vmware/modules/source/.patched found. You have already patched your sources. Exiting You might remove the .patched file in case that you upgraded/changed your kernel and you need to apply the patch again. Disclaimer: The patch is "as-is" and the patcher is originally created by Artem S. Tashkinov, and later modified by An_tony. Please refer to the VMware forum in case of questions or problems. There are also patches available for older versions of VMware Player or Workstation.

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  • Linux network stack : adding protocols with an LKM and dev_add_pack

    - by agent0range
    Hello, I have recently been trying to familiarize myself with the Linux Networking stack and device drivers (have both similarly named O'Reilly books) with the eventual goal of offloading UDP. I have already implemented UDP on the NIC but now the hard part... Rather than ask for assistance on this larger goal I was hoping someone could clarify for me a particular snippet I found that is part of a LKM which registeres a new protocol (OTP) that acts as a filter between the device driver and network stack. http://www.phrack.org/archives/55/p55_0x0c_Building%20Into%20The%20Linux%20Network%20Layer_by_lifeline%20&%20kossak.txt (Note: this Phrack article contains three different modules, code for the OTP is at the bottom of the page) In the init function of his example he has: otp_proto.type = htons(ETH_P_ALL); otp_proto.func = otp_func; dev_add_pack(&otp_proto); which (if I understand correctly) should register otp_proto as a packet sniffer and put it into the ptype_all data structure. My question is about the dev_add_pack. Is it the case that the protocol being registered as a filter will always be placed at this layer between L2 and the device driver? Or, for instance could I make such a filtering occur between the application and transport layers (analyze socket parameters) using the same process? I apologize if this is confusing - I am having some trouble wrapping my head around the bigger picture when it comes to modules altering kernel stack functionality. Thanks

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  • kernel panic- not syncing: attempted to kill init!

    - by Jill
    I am not very technical. My system has frozen 3 times in March--- this is what was on screen... Ubuntu 10.04.4 LTS Admin.sybalsky.com tty1 admin.sybalsky.com login: [683454.747106] kernel panic- not syncing: attempted to kill init! I know the system is running: Linux admin.sybalsky.com 2.6.32-40-generic-pae #87-Ubuntu SMP Mon Mar 5 21:44:34 UTC 2012 i686 GNU/Linux Ubuntu 10.04.4 LTS Can you tell me what this all means and why it is happening and what can I do about it?

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  • Linux Servers to Get Kernel Refresh

    <b>ServerWatch:</b> "A new version of a major Linux server OS distro: interesting. A new version of Windows: intriguing. A new version of OS X: could be fun to play with. But a new Linux kernel? Big deal."

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  • Mac OSX: Passing a link to file from user process to kernel module.

    - by Inso Reiges
    Hello, I need to pass a link to file from a user process to the OSX kernel driver. By link i mean anything that uniquely identifies a file on the local filesystem. I need that link to do I/O on that file in kernel. The most obvious solution seems to pass a file name and use a VFS vnode lookup. However i noticed, that Apple Disk Images helper process passes a raw data array for image-path property to driver when attaching a disk image file: <2f 56 6f 6c 75 6d 65 73 2f 73 74 6f 72 61 67 65 2f 74 65 73 74 32 2e 64 6d 67> What is that diskimages-helper passes to the kernel driver? Some serialized type perhaps? If yes, what type is it and how can i use it?

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  • Mac OSX: Passing a file from user process to kernel module.

    - by Inso Reiges
    Hello, I need to pass a link to file from a user process to the OSX kernel driver. By link i mean anything that uniquely identifies a file on the local filesystem. I need that link to do I/O on that file in kernel. The most obvious solution seems to pass a file name and use a VFS vnode lookup. However i noticed, that Apple Disk Images helper process passes a raw data array for image-path property to driver when attaching a disk image file: <2f 56 6f 6c 75 6d 65 73 2f 73 74 6f 72 61 67 65 2f 74 65 73 74 32 2e 64 6d 67> What is that diskimages-helper passes to the kernel driver? Some serialized type perhaps? If yes, what type is it and how can i use it?

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