Bug 163381 - RHEL3U5 x86-64 : xw9300 & numa=on swaps behaviour is unexpected
RHEL3U5 x86-64 : xw9300 & numa=on swaps behaviour is unexpected
Product: Red Hat Enterprise Linux 3
Classification: Red Hat
Component: kernel (Show other bugs)
x86_64 Linux
medium Severity medium
: ---
: ---
Assigned To: Larry Woodman
Brian Brock
Depends On:
Blocks: 168424
  Show dependency treegraph
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
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2006-03-15 11:16:14 EST
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)

  None (edit)
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.


Note You need to log in before you can comment on or make changes to this bug.