According to my attempts to fix this bug, I totally disagree with you. This bug is caused by pure design of current block dev layer. Methods which are good to develop code is absolutely improper for developing ideas. It's probably the key problem of the Linux Comunity. Currently, there is merged WA for block devices with a good queue such as Samsung Pro NVMe.
WBR, Vitaly (In reply to _Vi from comment #665) > As far as I understand, this is kind of meta-bug: there are multiple causes > and multiple fixes. > > "I do bulk IO and it gets slow" sounds rather general, and problem that can > resurface anytime due to some new underlying issue. So the problem cannot be > really "closed for good" no matter how much technical progress is made. > > For me 12309 basically stopped happening unless I deliberately tune > "/proc/sys/vm/dirty_*" values to non-typical ranges and forgot to revert > them back. I see system controllably slowing down processes doing bulk IO so > the system in general stays reasonable. This behaviour is one of outcomes of > this bug. > > I don't expect meaningful technical discussion to be happen in this thread. > It should just serve as a hub for linking to specific new issues. -- 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/595047 Title: Frequent swapping causes system to hang Status in Linux: Fix Released Status in linux package in Ubuntu: Incomplete Bug description: Periodically I notice my system slows to a near stand still, and the hard drive light is constantly going. This seems to be a massive amount of disk i/o and it lasts for a long time (lets say 30 mins to put a number on it). I installed and ran iotop (`iotop -a`) and it seems to point to jbd2. From what I can see jbd2 is related to ext4 journaling, but I cannot figure out how to kill this operation. It might even be a red herring because I have also stopped the disk activity by kill either chromium or firefox. I need to understand what else I can do to troubleshoot this. $ lsb_release -rd Description: Ubuntu maverick (development branch) Release: 10.10 Up-to-date as of 16th June 2010. --- AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23. AplayDevices: **** List of PLAYBACK Hardware Devices **** card 0: Intel [HDA Intel], device 0: ALC272X Analog [ALC272X Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 Architecture: i386 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: Intel [HDA Intel], device 0: ALC272X Analog [ALC272X Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: pgoodall 1372 F.... pulseaudio CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Card hw:0 'Intel'/'HDA Intel at 0x56440000 irq 44' Mixer name : 'Realtek ALC272X' Components : 'HDA:10ec0272,1025022c,00100001' Controls : 14 Simple ctrls : 8 DistroRelease: Ubuntu 10.10 Frequency: Once a day. HibernationDevice: RESUME=UUID=145f27a9-859a-4987-8132-ac878c832747 InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Alpha i386 (20100602.2) MachineType: Acer AO531h Package: linux (not installed) ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-6-generic root=UUID=11f96f8b-5e04-4e20-a201-0fa5d0fc07fa ro quiet splash ProcEnviron: PATH=(custom, user) LANG=en_GB.utf8 SHELL=/bin/bash ProcVersionSignature: Ubuntu 2.6.35-6.9-generic 2.6.35-rc3 Regression: Yes RelatedPackageVersions: linux-firmware 1.37 Reproducible: No Tags: maverick ubuntu-une kconfig regression-potential needs-upstream-testing Uname: Linux 2.6.35-6-generic i686 UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare dmi.bios.date: 12/22/2009 dmi.bios.vendor: Acer dmi.bios.version: v0.3304 dmi.board.asset.tag: Base Board Asset Tag dmi.board.vendor: Acer dmi.board.version: Base Board Version dmi.chassis.type: 1 dmi.chassis.vendor: Chassis Manufacturer dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAcer:bvrv0.3304:bd12/22/2009:svnAcer:pnAO531h:pvr1:rvnAcer:rn:rvrBaseBoardVersion:cvnChassisManufacturer:ct1:cvrChassisVersion: dmi.product.name: AO531h dmi.product.version: 1 dmi.sys.vendor: Acer To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/595047/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
