Would you be able to recreate this problem away from 3ware controller
and/or non-RAID-5 setting ? Check out:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=121434, comment #263 -
more specifically (cut and paste the relevant info):
"Different kernels might tweak different parameters that will affect RAID-5
operations on 3Ware Escalade 7000/8000 series controllers.
Finding a good set (3Ware's site has excellent recommendations) and putting
those in your /etc/rc.d/rc.local or similar is _crucial_ for a production
server
to minimize any change in defaults with any new kernel."
-- Wendy
----Original Message Follows----
From: Gaspar Bakos <gbakos@xxxxxxxxxxxxxxx>
Reply-To: gbakos@xxxxxxxxxxxxxxx
To: linux-xfs@xxxxxxxxxxx
Subject: kswapd causing giant load
Date: Sat, 4 Jun 2005 12:35:48 -0400 (EDT)
Hi,
I encounter a giant load (up to 10.0) when I copy files, either from a
remote server to the local machine, or even locally. Because I use XFS
filesystem, I decided to forward my email to the XFS list; maybe
anyone has a clue.
The setup is:
OS: Redhat FC3 with 2.6.11-1.14_FC3smp (redhat distro) kernel, XFS
filesystem
HW: Dual opteron 2.0GHz on Tyan motherboard, 4Gb RAM
The partition i am using is:
2.1Tb hardware RAID-5 unit served by 3ware controller (8 x 300Gb)
OR
300Gb simple SATA disk, also served by a 3ware controller.
I have no clue where to start combatting this problem.
- Kernel specific?
- Due to improper setup of the 3ware controllers?
- XFS filesystem specific?
10715 hatuser 15 0 35432 2792 2020 R 28.3 0.1 1:45.06 sshd
10724 hatuser 16 0 17504 11m 664 R 8.3 0.3 0:33.56 rsync
175 root 15 0 0 0 0 S 19.7 0.0 136:25.58 kswapd0
172 root 15 0 0 0 0 S 0.3 0.0 1:23.59 pdflush
174 root 15 0 0 0 0 S 0.3 0.0 99:18.93 kswapd1
Before I start extensive experimenting, maybe someone knows right away
what causes high loads due to "kswapd* and pdflush".
Cheers
Gaspar
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