To: Red Hat Network Users List <rhn-users redhat com>
Subject: Re: [rhn-users] kswapd problems
Date: Thu, 9 Dec 2004 11:47:39 -0600
We have noticed the same problem on
several systems. There is an open bugzilla issue about this, but
to my knowledge the only fix at this point is to revert back to kernel-2.4.21-15.04.ELsmp.
Here is the link to the bugzilla issue:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=133183
Hope this helps,
Jim Webb, RHCE
Administrative Office of the United States Courts
IT Systems Deployment and Support Division, San Antonio, TX
"Doctor Khumalo"
<doctortechie hotmail com> Sent by: rhn-users-bounces redhat com
12/08/2004 02:59 PM
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Subject
[rhn-users] kswapd problems
I have two servers running RH Enterprise Linux (release)
3 with the latest
up2date patches running on kernel 2.4.21-20.ELsmp. These are Dell
PowerEdge
1750 server with external Powervault 220s RAID. Both servers are
experiencing latency when running basic I/O commands such as scp or rsync.
These appear to cause kswapd to rack up an enormous amount of processor
resources. For example, yesterday morning, I began an scp session on each
server, transferring a directory with a size of 300 GB. This morning I
came
in and found that the load average was over 500 on each server and that
kswapd had a CPU percentage of 198.
This has happened repeatedly over the past month. To replicate this,
I log
on to the first server and scp the files and directories from a file system
on the second server. This is reciprocated by running an scp process
for
files and directories from a file system the first server. Both file
systems are on /dev/sdb, an external RAID box, and are over 300 GB. Both
servers are on the same Gigabit network.
The files transfer at approximately 15 GB an hour until about eight hours
into the job when it begins to slow down to about 4-5 GB an hour and the
load average increases over 200. It is at this point that kswapd begins
to
go through the roof while ssh and scp use relatively little resources
(according to top and ps wauxg).
After I kill the scp job, about 20 hours into it, kswapd continues to use
the same amount of resources.
I have done this CPU hyper threading enabled and disabled with no
improvement.
Anyone ever experienced this before?
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