[Kernel-packages] [Bug 620074]
This is a very unique way of getting it right. https://pestclue.com/ -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/620074 Title: Thrashing turns system unusable Status in Linux: Fix Released Status in linux package in Ubuntu: Incomplete Bug description: Thrashing on Ubuntu seems to make it almost impossible to interact with the system. It can be minutes before any interaction has an effect, including remote connections. This means that if a program either misbehaves or simply needs more memory than available RAM, it might be hard or impossible to stop it, either locally or remotely. This can be both an annoyance and a security threat (since a process without elevated privileges can effectively hang the system). It is not hard to make a system go into thrashing, especially if it is low on memory (that's probably true in general, not only of Ubuntu). On my ASUS netbook running Ubuntu 10.04, with only 1GB RAM, thrashing can occur as easily as running both Chromium (which is a bit of a memory hog) and the Resynthesizer plugin in the GIMP at the same time. Running these programs plus another memory-intensive program like Mathematica can generate thrashing even when 2GB or 4GB of physical memory are available. I am including a short C++ program that allocates and accesses a large amount of memory, guaranteeing thrashing will occur on any system. Using this or any other memory-intensive program, the steps required to reproduce the condition I described are 1. Start one or more memory-intensive programs. 2. As RAM is filled, paging will start, and if the programs try to access the memory that has been swapped out, thrashing occurs. What happens? - Interactivity with the system drops to almost zero. Mouse barely moves, keyboard interaction has huge delays (tens of seconds), starting a terminal or switching to one if one is already open can take minutes, as is the case with remote (e.g. SSH) connections. What I would expect/want to happen? - The system should keep interactivity levels high at all times. While I'm not at all an expert on this, I would think this could be achieved by either not allowing paging out of essential user-interface elements, or more generally by giving processes that generate a lot of page faults comparatively lower priority than other processes, especially processes that are just starting, or are part of the user interface. To use the included program, compile with g++ -o bug bug.cc and run with ./bug where is the amount of memory in MB to be allocated. One can run several instances of the program at the same time, to compete for memory. One can use top, free or the System Monitor to check when RAM is completely filled, and thrashing starts. PS: This seems to be a long-standing issue with Linux, it's not limited to the current version of Ubuntu. ProblemType: Bug DistroRelease: Ubuntu 10.04 Package: linux-image-2.6.32-24-generic 2.6.32-24.39 Regression: No Reproducible: Yes ProcVersionSignature: Ubuntu 2.6.32-24.38-generic 2.6.32.15+drm33.5 Uname: Linux 2.6.32-24-generic x86_64 NonfreeKernelModules: nvidia AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21. Architecture: amd64 AudioDevicesInUse: USERPID ACCESS COMMAND /dev/snd/controlC0: tibi 1596 F pulseaudio /dev/snd/pcmC0D0p: tibi 1596 F...m pulseaudio /dev/snd/controlC1: tibi 1596 F pulseaudio CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Card hw:0 'NVidia'/'HDA NVidia at 0xfe02 irq 21' Mixer name : 'Nvidia MCP78 HDMI' Components : 'HDA:10ec0888,10250153,00100202 HDA:10de0002,10de0101,0010' Controls : 37 Simple ctrls : 20 Card1.Amixer.info: Card hw:1 'U0x46d0x8da'/'USB Device 0x46d:0x8da at usb-:00:04.0-2, full speed' Mixer name : 'USB Mixer' Components : 'USB046d:08da' Controls : 3 Simple ctrls : 2 Date: Wed Aug 18 13:01:30 2010 HibernationDevice: RESUME=UUID=9464cfb9-e39a-46ab-bf3a-01a7f2194ab1 InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429) IwConfig: lono wireless extensions. eth0 no wireless extensions. MachineType: eMachines EL1210-09 ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-24-generic root=UUID=93f3d657-74ac-4853-acab-704f74ab4cd0 ro quiet splash ProcEnviron: PATH=(custom, user) LANG=en_US.utf8 SHELL=/bin/bash RelatedPackageVersions: linux-firmware 1.34.1 RfKill: SourcePackage: linux dmi.bios.date: 09/23/2008 dmi.bios.vendor: Phoenix Technologies, LTD dmi.bios.version: R01-A0 dmi.board.name: WMCP78M dmi.board.vendor: eMachines dmi.chassis.asset.tag: 00 dmi.chassis.type: 3 dmi.chassis.vendor:
[Kernel-packages] [Bug 620074]
(In reply to Vesselin Kostadinov from comment #547) > This seems to be a hardware related issue, at least in some cases. > Can the other people experiencing it confirm whether they have a WD Greed > hard disk? > Google search for "wd15eads firmware" reveals quite a few people having > similar problems. > I have one of these hard disks and I was using it on a fanless VIA Samuel 2 > (pre-686) CPU and I was seeing the high IOWait problem and associated poor > performance. When I put the same hard disk in a dual AMD opteron it had the > same problem. > Then I did a full backup and restore on a different hard disk. It is the > same debian system on the same VIA cpu but now the high IOWait times are > gone and the performance is adequate for the CPU. > I should point out that the kernel should not suffer poor overall > performance during disk I/O even on flakey hardware, especially with swap > disabled. > The offending hard disk is now blanked. I can run a few tests with it if > somebody is interested. http://pestclue.com/ -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/620074 Title: Thrashing turns system unusable Status in Linux: Fix Released Status in linux package in Ubuntu: Incomplete Bug description: Thrashing on Ubuntu seems to make it almost impossible to interact with the system. It can be minutes before any interaction has an effect, including remote connections. This means that if a program either misbehaves or simply needs more memory than available RAM, it might be hard or impossible to stop it, either locally or remotely. This can be both an annoyance and a security threat (since a process without elevated privileges can effectively hang the system). It is not hard to make a system go into thrashing, especially if it is low on memory (that's probably true in general, not only of Ubuntu). On my ASUS netbook running Ubuntu 10.04, with only 1GB RAM, thrashing can occur as easily as running both Chromium (which is a bit of a memory hog) and the Resynthesizer plugin in the GIMP at the same time. Running these programs plus another memory-intensive program like Mathematica can generate thrashing even when 2GB or 4GB of physical memory are available. I am including a short C++ program that allocates and accesses a large amount of memory, guaranteeing thrashing will occur on any system. Using this or any other memory-intensive program, the steps required to reproduce the condition I described are 1. Start one or more memory-intensive programs. 2. As RAM is filled, paging will start, and if the programs try to access the memory that has been swapped out, thrashing occurs. What happens? - Interactivity with the system drops to almost zero. Mouse barely moves, keyboard interaction has huge delays (tens of seconds), starting a terminal or switching to one if one is already open can take minutes, as is the case with remote (e.g. SSH) connections. What I would expect/want to happen? - The system should keep interactivity levels high at all times. While I'm not at all an expert on this, I would think this could be achieved by either not allowing paging out of essential user-interface elements, or more generally by giving processes that generate a lot of page faults comparatively lower priority than other processes, especially processes that are just starting, or are part of the user interface. To use the included program, compile with g++ -o bug bug.cc and run with ./bug where is the amount of memory in MB to be allocated. One can run several instances of the program at the same time, to compete for memory. One can use top, free or the System Monitor to check when RAM is completely filled, and thrashing starts. PS: This seems to be a long-standing issue with Linux, it's not limited to the current version of Ubuntu. ProblemType: Bug DistroRelease: Ubuntu 10.04 Package: linux-image-2.6.32-24-generic 2.6.32-24.39 Regression: No Reproducible: Yes ProcVersionSignature: Ubuntu 2.6.32-24.38-generic 2.6.32.15+drm33.5 Uname: Linux 2.6.32-24-generic x86_64 NonfreeKernelModules: nvidia AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21. Architecture: amd64 AudioDevicesInUse: USERPID ACCESS COMMAND /dev/snd/controlC0: tibi 1596 F pulseaudio /dev/snd/pcmC0D0p: tibi 1596 F...m pulseaudio /dev/snd/controlC1: tibi 1596 F pulseaudio CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Card hw:0 'NVidia'/'HDA NVidia at 0xfe02 irq 21' Mixer name : 'Nvidia MCP78 HDMI' Components : 'HDA:10ec0888,10250153,00100202 HDA:10de0002,10de0101,0010' Controls : 37 Simple ctrls : 20 Card1.Amixer.info: Card hw:1 'U0x46d0x8da'/'USB Device 0x46d:0x8da at usb-:00:04.0-2,
[Kernel-packages] [Bug 988799]
(In reply to Vesselin Kostadinov from comment #547) > This seems to be a hardware related issue, at least in some cases. > Can the other people experiencing it confirm whether they have a WD Greed > hard disk? > Google search for "wd15eads firmware" reveals quite a few people having > similar problems. > I have one of these hard disks and I was using it on a fanless VIA Samuel 2 > (pre-686) CPU and I was seeing the high IOWait problem and associated poor > performance. When I put the same hard disk in a dual AMD opteron it had the > same problem. > Then I did a full backup and restore on a different hard disk. It is the > same debian system on the same VIA cpu but now the high IOWait times are > gone and the performance is adequate for the CPU. > I should point out that the kernel should not suffer poor overall > performance during disk I/O even on flakey hardware, especially with swap > disabled. > The offending hard disk is now blanked. I can run a few tests with it if > somebody is interested. http://pestclue.com/ -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/988799 Title: Precise freezes under heavy i/o Status in Linux: Fix Released Status in linux package in Ubuntu: Fix Released Bug description: Whilst creating a VM with 20 GB persistent HD and my system froze until the disk was created. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: linux-image-3.2.0-23-generic 3.2.0-23.36 ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14 Uname: Linux 3.2.0-23-generic x86_64 NonfreeKernelModules: fglrx AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 2.0.1-0ubuntu5 Architecture: amd64 AudioDevicesInUse: USERPID ACCESS COMMAND /dev/snd/controlC2: gema 2526 F pulseaudio /dev/snd/controlC0: gema 2526 F pulseaudio /dev/snd/controlC1: gema 2526 F pulseaudio CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found. Card0.Amixer.info: Card hw:0 'Intel'/'HDA Intel at 0xfbaf8000 irq 52' Mixer name : 'VIA VT1708S' Components : 'HDA:11060397,104383c4,0010' Controls : 45 Simple ctrls : 22 Card1.Amixer.info: Card hw:1 'U0x46d0x81d'/'USB Device 0x46d:0x81d at usb-:00:1d.0-1.3, high speed' Mixer name : 'USB Mixer' Components : 'USB046d:081d' Controls : 2 Simple ctrls : 1 Card1.Amixer.values: Simple mixer control 'Mic',0 Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum Capture channels: Mono Limits: Capture 0 - 16 Mono: Capture 12 [75%] [24.00dB] [on] Card2.Amixer.info: Card hw:2 'Generic'/'HD-Audio Generic at 0xfbbfc000 irq 53' Mixer name : 'ATI R6xx HDMI' Components : 'HDA:1002aa01,00aa0100,00100200' Controls : 6 Simple ctrls : 1 Card2.Amixer.values: Simple mixer control 'IEC958',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Date: Thu Apr 26 11:59:11 2012 HibernationDevice: RESUME=UUID=f32abdd2-8167-48c2-9d93-61eeb2632ca0 InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1) IwConfig: lono wireless extensions. virbr0no wireless extensions. eth0 no wireless extensions. MachineType: System manufacturer System Product Name ProcEnviron: LANGUAGE=en_GB:en TERM=xterm PATH=(custom, user) LANG=en_GB.UTF-8 SHELL=/bin/zsh ProcFB: 0 VESA VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-23-generic root=UUID=109d1e55-4f64-489e-91e8-48ff46f6ba16 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.2.0-23-generic N/A linux-backports-modules-3.2.0-23-generic N/A linux-firmware1.79 RfKill: SourcePackage: linux UpgradeStatus: Upgraded to precise on 2012-04-25 (0 days ago) dmi.bios.date: 03/26/2010 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 0401 dmi.board.asset.tag: To Be Filled By O.E.M. dmi.board.name: P7P55D-E LX dmi.board.vendor: ASUSTeK Computer INC. dmi.board.version: Rev 1.xx dmi.chassis.asset.tag: Asset-1234567890 dmi.chassis.type: 3 dmi.chassis.vendor: Chassis Manufacture dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0401:bd03/26/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP7P55D-ELX:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion: dmi.product.name: System Product Name dmi.product.version: System Version dmi.sys.vendor: System manufacturer To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/988799/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net
[Kernel-packages] [Bug 988799]
This is a very unique way of getting it right. https://pestclue.com/ -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/988799 Title: Precise freezes under heavy i/o Status in Linux: Fix Released Status in linux package in Ubuntu: Fix Released Bug description: Whilst creating a VM with 20 GB persistent HD and my system froze until the disk was created. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: linux-image-3.2.0-23-generic 3.2.0-23.36 ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14 Uname: Linux 3.2.0-23-generic x86_64 NonfreeKernelModules: fglrx AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 2.0.1-0ubuntu5 Architecture: amd64 AudioDevicesInUse: USERPID ACCESS COMMAND /dev/snd/controlC2: gema 2526 F pulseaudio /dev/snd/controlC0: gema 2526 F pulseaudio /dev/snd/controlC1: gema 2526 F pulseaudio CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found. Card0.Amixer.info: Card hw:0 'Intel'/'HDA Intel at 0xfbaf8000 irq 52' Mixer name : 'VIA VT1708S' Components : 'HDA:11060397,104383c4,0010' Controls : 45 Simple ctrls : 22 Card1.Amixer.info: Card hw:1 'U0x46d0x81d'/'USB Device 0x46d:0x81d at usb-:00:1d.0-1.3, high speed' Mixer name : 'USB Mixer' Components : 'USB046d:081d' Controls : 2 Simple ctrls : 1 Card1.Amixer.values: Simple mixer control 'Mic',0 Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum Capture channels: Mono Limits: Capture 0 - 16 Mono: Capture 12 [75%] [24.00dB] [on] Card2.Amixer.info: Card hw:2 'Generic'/'HD-Audio Generic at 0xfbbfc000 irq 53' Mixer name : 'ATI R6xx HDMI' Components : 'HDA:1002aa01,00aa0100,00100200' Controls : 6 Simple ctrls : 1 Card2.Amixer.values: Simple mixer control 'IEC958',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Date: Thu Apr 26 11:59:11 2012 HibernationDevice: RESUME=UUID=f32abdd2-8167-48c2-9d93-61eeb2632ca0 InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1) IwConfig: lono wireless extensions. virbr0no wireless extensions. eth0 no wireless extensions. MachineType: System manufacturer System Product Name ProcEnviron: LANGUAGE=en_GB:en TERM=xterm PATH=(custom, user) LANG=en_GB.UTF-8 SHELL=/bin/zsh ProcFB: 0 VESA VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-23-generic root=UUID=109d1e55-4f64-489e-91e8-48ff46f6ba16 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.2.0-23-generic N/A linux-backports-modules-3.2.0-23-generic N/A linux-firmware1.79 RfKill: SourcePackage: linux UpgradeStatus: Upgraded to precise on 2012-04-25 (0 days ago) dmi.bios.date: 03/26/2010 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 0401 dmi.board.asset.tag: To Be Filled By O.E.M. dmi.board.name: P7P55D-E LX dmi.board.vendor: ASUSTeK Computer INC. dmi.board.version: Rev 1.xx dmi.chassis.asset.tag: Asset-1234567890 dmi.chassis.type: 3 dmi.chassis.vendor: Chassis Manufacture dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0401:bd03/26/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP7P55D-ELX:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion: dmi.product.name: System Product Name dmi.product.version: System Version dmi.sys.vendor: System manufacturer To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/988799/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
