Bug 163381
| Summary: | RHEL3U5 x86-64 : xw9300 & numa=on swaps behaviour is unexpected | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 3 | Reporter: | Issue Tracker <tao> |
| Component: | kernel | Assignee: | Larry Woodman <lwoodman> |
| Status: | CLOSED ERRATA | QA Contact: | Brian Brock <bbrock> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 3.0 | CC: | jparadis, petrides, tao, tburke |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | RHSA-2006-0144 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2006-03-15 16:16:14 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: | |||
| Bug Depends On: | |||
| Bug Blocks: | 168424 | ||
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Description
Issue Tracker
2005-07-15 18:40:15 UTC
I'll try the reproducer, but my opinion at this point is that this is a known issue with RHEL3 NUMA that will not be fixed in an update. Basically, NUMA will allocate all memory on a thread's home node before resorting to using other nodes. This causes swapping to occur when we get over the swap threshold for a given node, even if other nodes have plenty of free memory. Fixing this would require either swap parameter changes or significant invasive VM changes that are too invasive for a late update, in my opinion. This is essentially a duplicate of bug 130387. A fix for this problem has just been committed to the RHEL3 U7 patch pool this evening (in kernel version 2.4.21-37.12.EL). To enable an improved NUMA-friendly page allocation policy, please set /proc/sys/vm/numa_memory_allocator via the "sysctl" command (or put "vm.numa_memory_allocator = 1" in /etc/sysctl.conf). Bug fix, Devel ACK. An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2006-0144.html |