[CentOS] 3Ware 9550SX and latency/system responsiveness
Ross S. W. Walker
rwalker at medallion.com
Tue Sep 25 17:26:45 UTC 2007
Simon Banton wrote:
> At 10:36 -0400 25/9/07, Ross S. W. Walker wrote:
> >Post the modinfo <driver name> to the list just in case somebody
> >else knows of any issues with the version you are running.
> This is from RHEL5 - it's the driver that comes built-in:
> [root at serv1 ~]# modinfo 3w-9xxx
> version: 2.26.02.007
> license: GPL
> description: 3ware 9000 Storage Controller Linux Driver
> author: AMCC
> srcversion: 029473DD729D96D687985E4
> alias: pci:v000013C1d00001003sv*sd*bc*sc*i*
> alias: pci:v000013C1d00001002sv*sd*bc*sc*i*
> depends: scsi_mod
> vermagic: 2.6.18-8.el5 SMP mod_unload 686 REGPARM
> 4KSTACKS gcc-4.1
> The overall responsiveness of the system under benchmarking when
> running RHEL5 is somewhat better than that when running CentOS 4.5.
Off of 3ware's support site I was able to download and compile the
latest stable release which has this modinfo:
[root at mfg-nyc-iscsi1 driver]# modinfo 3w-9xxx.ko
description: 3ware 9000 Storage Controller Linux Driver
vermagic: 2.6.20-1.2320.fc5smp SMP mod_unload 686 4KSTACKS
I compiled it on a fc5 box, but that shouldn't matter.
As far as the "responsiveness" is concerned, the 2.6.18 kernel made
some substantial improvements to the "cfq" io scheduler that helped
with interactive user experience. If you are using the box as a
server though I would try the "deadline" or "noop" scheduler with
this card as you may see substantial performance improvements with
these schedulers and this card.
Try setting the io scheduler to "deadline" and re-run the benchmarks
to see what I mean.
This e-mail, and any attachments thereto, is intended only for use by
the addressee(s) named herein and may contain legally privileged
and/or confidential information. If you are not the intended recipient
of this e-mail, you are hereby notified that any dissemination,
distribution or copying of this e-mail, and any attachments thereto,
is strictly prohibited. If you have received this e-mail in error,
please immediately notify the sender and permanently delete the
original and any copy or printout thereof.
More information about the CentOS