Have a look at these pages:
http://www.bofh-hunter.com/2008/06/13/3ware-performance-in-centos/
https://bugzilla.redhat.com/show_bug.cgi?id=444759
I'm comparing the default 5.1 64bit kernel with the patched one posted
in the bug report (kernel-2.6.18-53.1.21.el5.bz321111.x86_64) and I
don't quite see any significant difference in write performance for this
command:
dd if=/dev/zero of=/logs/test bs=100M count=1000
(100GB of data, written in 100MB blocks)
It's a Supermicro server, the motherboard is (according to the stuff
painted on the mobo itself) Super X7DBI+, Intel Xeon L5420 with 8 cores
total, 3ware 9650SE using the driver from the manufacturer's site.
I tested 2 disks in a mirror RAID volume.
Results:
kernel time speed
====== ==== =====
patched 75min 23M/s
original 51min 34M/s
patched 48min 36M/s
original 61min 28M/s
--
Florin Andrei
http://florin.myip.org/
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