Bug 163381 - RHEL3U5 x86-64 : xw9300 & numa=on swaps behaviour is unexpected
RHEL3U5 x86-64 : xw9300 & numa=on swaps behaviour is unexpected
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 3
Classification: Red Hat
Component: kernel (Show other bugs)
3.0
x86_64 Linux
medium Severity medium
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Assigned To: Larry Woodman
Brian Brock
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Depends On:
Blocks: 168424
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Reported: 2005-07-15 14:40 EDT by Issue Tracker
Modified: 2007-11-30 17:07 EST (History)
4 users (show)

See Also:
Fixed In Version: RHSA-2006-0144
Doc Type: Bug Fix
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Last Closed: 2006-03-15 11:16:14 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Issue Tracker 2005-07-15 14:40:15 EDT
Escalated to Bugzilla from IssueTracker
Comment 30 Jim Paradis 2005-08-16 15:07:52 EDT
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.
Comment 35 Ernie Petrides 2005-08-29 17:19:09 EDT
This is essentially a duplicate of bug 130387.
Comment 37 Ernie Petrides 2005-11-30 02:49:11 EST
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).
Comment 39 Peter Martuccelli 2005-12-08 09:52:16 EST
Bug fix, Devel ACK.
Comment 42 Red Hat Bugzilla 2006-03-15 11:16:14 EST
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

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