From: Markus Roeffen (markus.roeffen_at_iws.uni-stuttgart.de)
Date: Wed Apr 04 2007 - 11:00:49 CEST
Message-ID: <46136941.8020406@iws.uni-stuttgart.de> Date: Wed, 04 Apr 2007 11:00:49 +0200 From: Markus Roeffen <markus.roeffen@iws.uni-stuttgart.de> Subject: Re: Antw: Re: [suse-sles-e] Re: catastrophic disk-performance on SLES10 with SATA drives
Hello Andreas,
I have already played around with this settings in March,
but it didn't work.
(By the way: You can check your scheduler with the
following command:
cat /var/log/boot.msg|grep -i "scheduler" )
But I still have my bookmarks from these trial & error
sessions, so maybe I can give you some interesting links.
http://www-941.ibm.com/collaboration/wiki/display/LinuxP/Performance+Tuning
http://download.boulder.ibm.com/ibmdl/pub/software/dw/linux390/perf/pht_share_tampa_2007.pdf
http://drwetter.org/suse10.1/report.suse-10.1.html
I think, I've also written some other links on paper, but
these are partially in German.
Best regards
Markus
> Hi Markus,
>
> just one comment for today.
> I've never tested it, but I can imagine that the elevator mode could
> have an impact. SuSE comes with elevator=cfg as standard. In this mode
> the kernel tries to reorder write requests. This could be counterproductive
> if you have a hardware raid with buffer memory and own logic of summing up
> write/read requests.
>
> I found http://www.redhat.com/magazine/008jun05/features/schedulers/
> to be really interesting.
>
> Probably you have time and fun trying it.
>
> Best regards
> Andreas Mock
-- ------------------------------- Markus Roeffen Institut für Wasserbau IWS Universität Stuttgart Pfaffenwaldring 61 70569 Stuttgart Tel: +49(0)711/685-67010 Fax: +49(0)711/685-67020 Mail: markus.roeffen@iws.uni-stuttgart.de --------------------------------------------------------------------- To unsubscribe, e-mail: suse-sles-e-unsubscribe@suse.com For additional commands, e-mail: suse-sles-e-help@suse.com
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