Bug 142825
| Summary: | performance degrades dramatically when swap exceeds 100M | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 3 | Reporter: | Need Real Name <rovero> |
| Component: | kernel | Assignee: | Larry Woodman <lwoodman> |
| Status: | CLOSED WONTFIX | QA Contact: | Brian Brock <bbrock> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 3.0 | CC: | petrides, riel |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | i686 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2007-10-19 19:11:17 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Significant VM improvements were made during the course of Update 4. The RHEL3 U4 kernel (2.4.21-27.EL) is scheduled for release on Monday of next week (12/20). Please let us know if the U4 kernel performs acceptably in this scenario. Thanks in advance. This bug is filed against RHEL 3, which is in maintenance phase. During the maintenance phase, only security errata and select mission critical bug fixes will be released for enterprise products. Since this bug does not meet that criteria, it is now being closed. For more information of the RHEL errata support policy, please visit: http://www.redhat.com/security/updates/errata/ If you feel this bug is indeed mission critical, please contact your support representative. You may be asked to provide detailed information on how this bug is affecting you. |
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4.3) Gecko/20040924 Description of problem: Workstation hangs for 5 - 30 seconds when active swap exceeds 100M (of 1024M available) on P4 non-SMP. Performance is significantly degraded from RH9. Linux jetstream 2.4.21-20.EL #1 Wed Aug 18 20:58:25 EDT 2004 i686 i686 i386 GNU/Linux 08:58:55 up 6 days, 20 min, 2 users, load average: 0.13, 0.14, 0.10 75 processes: 74 sleeping, 1 running, 0 zombie, 0 stopped CPU states: cpu user nice system irq softirq iowait idle total 20.3% 0.0% 0.0% 0.0% 0.0% 0.0% 79.6% Mem: 511464k av, 272620k used, 238844k free, 0k shrd, 26252k buff 171656k actv, 58732k in_d, 6804k in_c Swap: 1052216k av, 113612k used, 938604k free 115980k cached PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND 2096 root 15 0 77376 32M 4604 S 18.8 6.5 101:32 0 X 1 root 15 0 484 452 428 S 0.0 0.0 0:03 0 init 2 root 15 0 0 0 0 SW 0.0 0.0 0:00 0 keventd 3 root 15 0 0 0 0 SW 0.0 0.0 0:00 0 kapmd 4 root 34 19 0 0 0 SWN 0.0 0.0 0:00 0 ksoftirqd/0 7 root 15 0 0 0 0 SW 0.0 0.0 0:00 0 bdflush 5 root 15 0 0 0 0 SW 0.0 0.0 0:09 0 kswapd 6 root 15 0 0 0 0 SW 0.0 0.0 0:01 0 kscand 8 root 15 0 0 0 0 SW 0.0 0.0 0:00 0 kupdated 9 root 25 0 0 0 0 SW 0.0 0.0 0:00 0 mdrecoveryd 13 root 15 0 0 0 0 SW 0.0 0.0 0:03 0 kjournald 68 root 25 0 0 0 0 SW 0.0 0.0 0:00 0 khubd 213 root 15 0 0 0 0 SW 0.0 0.0 0:00 0 kjournald 214 root 15 0 0 0 0 SW 0.0 0.0 0:00 0 kjournald 215 root 15 0 0 0 0 SW 0.0 0.0 0:00 0 kjournald Version-Release number of selected component (if applicable): kernel 2.4.21-20.EL How reproducible: Always Steps to Reproduce: 1. Open a number of applications 2. When swap exceeds 100M, switch between apps 3. Time the delay when switching between aps Actual Results: Switching between applications (bringing mozilla to foreground) takes between 5 and 30 seconds when swap size exceeds some threshold Expected Results: Application should move to foreground and accept focus in a fraction of a second. Additional info: This significant decrease in system performance will be unacceptable to customers who have been using RH9 or other distributions.