Bug 866439
| Summary: | kwapd0 using 100% cpu | ||||||
|---|---|---|---|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | volnei | ||||
| Component: | kernel | Assignee: | Kernel Maintainer List <kernel-maint> | ||||
| Status: | CLOSED WONTFIX | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||
| Severity: | unspecified | Docs Contact: | |||||
| Priority: | unspecified | ||||||
| Version: | 17 | CC: | gansalmon, itamar, john.ellson, jonathan, kernel-maint, madhu.chinakonda, travneff | ||||
| Target Milestone: | --- | ||||||
| Target Release: | --- | ||||||
| Hardware: | Unspecified | ||||||
| OS: | Unspecified | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2013-08-01 02:18:32 UTC | Type: | Bug | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Attachments: |
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I face something similar with current F18 x64 kernels (3.8.x). Sometimes kswapd0 consumes a lot of CPU with no relation to swapping (free RAM exists, swap is empty, no visible apps activity which could be related, no swap activity in iotop). System slowdowns significantly and then may even freeze with no reaction on magic keys (sometimes). HDD LED lights constantly while it. Not sure in the reason because at the same time a lot of CPU is spent on HW IRQ (have an ugly USB device which generates ~1000 irqs/s). Disconnecting of that device doesn't cure the slowdown symptoms when they already exists, though. Overall effect seems to be accumulated — firstly you don't notice it but then things became more and more worse without any significant input from you. kernel-3.8.6-203.fc18.x86_64 This message is a reminder that Fedora 17 is nearing its end of life. Approximately 4 (four) weeks from now Fedora will stop maintaining and issuing updates for Fedora 17. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as WONTFIX if it remains open with a Fedora 'version' of '17'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version prior to Fedora 17's end of life. Bug Reporter: Thank you for reporting this issue and we are sorry that we may not be able to fix it before Fedora 17 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora, you are encouraged change the 'version' to a later Fedora version prior to Fedora 17's end of life. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete. Fedora 17 changed to end-of-life (EOL) status on 2013-07-30. Fedora 17 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. Thank you for reporting this bug and we are sorry it could not be fixed. |
Created attachment 627336 [details] dmesg file Description of problem: kwap is using 100% cpu. I do not know why this is happening and to Honestly, I had seen the problem but had not gone through it. Would help to solve it. Please, if you need more information please let me know Thanks Version-Release number of selected component (if applicable): kernel-3.6.1-1.fc17.x86_64 How reproducible: Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info: [root@vmsmb01 ~]# free total used free shared buffers cached Mem: 3786572 1583048 2203524 0 114472 973040 -/+ buffers/cache: 495536 3291036 Swap: 6258684 0 6258684 Tasks: 126 total, 2 running, 124 sleeping, 0 stopped, 0 zombie Cpu0 : 0.0%us, 0.0%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.3%st Cpu1 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu2 : 0.0%us, 99.7%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.3%hi, 0.0%si, 0.0%st Cpu3 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 3786572k total, 1578952k used, 2207620k free, 113508k buffers Swap: 6258684k total, 0k used, 6258684k free, 974048k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 61 root 20 0 0 0 0 R 99.5 0.0 2045:59 kswapd0 1253 mysql 20 0 870m 317m 6896 S 0.3 8.6 2:40.31 mysqld 10039 root 20 0 15248 1368 1028 R 0.3 0.0 0:00.07 top 1 root 20 0 67564 25m 1868 S 0.0 0.7 0:01.94 systemd 2 root 20 0 0 0 0 S 0.0 0.0 0:00.01 kthreadd 3 root 20 0 0 0 0 S 0.0 0.0 0:00.31 ksoftirqd/0 5 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0H 6 root 20 0 0 0 0 S 0.0 0.0 0:00.01 kworker/u:0 7 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/u:0H 8 root RT 0 0 0 0 S 0.0 0.0 0:00.17 migration/0 9 root RT 0 0 0 0 S 0.0 0.0 0:01.14 watchdog/0 10 root RT 0 0 0 0 S 0.0 0.0 0:00.02 migration/1 11 root 20 0 0 0 0 S 0.0 0.0 0:03.80 kworker/1:0 12 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/1:0H 13 root 20 0 0 0 0 S 0.0 0.0 0:00.39 ksoftirqd/1 14 root RT 0 0 0 0 S 0.0 0.0 0:01.58 watchdog/1 15 root RT 0 0 0 0 S 0.0 0.0 0:00.06 migration/2 17 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/2:0H 18 root 20 0 0 0 0 S 0.0 0.0 0:00.52 ksoftirqd/2 19 root RT 0 0 0 0 S 0.0 0.0 0:02.39 watchdog/2 20 root RT 0 0 0 0 S 0.0 0.0 0:00.06 migration/3 22 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/3:0H 23 root 20 0 0 0 0 S 0.0 0.0 0:00.02 ksoftirqd/3 24 root RT 0 0 0 0 S 0.0 0.0 0:02.33 watchdog/3 25 root 0 -20 0 0 0 S