From: Markus Roeffen (markus.roeffen_at_iws.uni-stuttgart.de)
Date: Wed Apr 04 2007 - 12:23:56 CEST
Message-ID: <46137CBC.3080104@iws.uni-stuttgart.de> Date: Wed, 04 Apr 2007 12:23:56 +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've made a few benchmarks with the tool "bonnie" (
http://www.textuality.com/bonnie/ ) and just wanted to post the results.
I've taken the RAID 5 SCSI results with ext3 at
http://cc.jlab.org/docs/scicomp/benchmark/bonnie.html as reference result.
Reference system (according to jlab.org):
* Processors - Dual Intel Pentium III 1.26 GHz
* Memory - 512 MBytes 133 MHz SDRAM ECC
* Motherboard - Intel SDS2
* RAID Controller - Mylex eXtremeRAID 2000 with 64 MBytes cache
* Disk Drives - Seagate ST373405LC (Qty. 7)
* RAID Configuration - RAID-5 (4 disks on channel-0 and 3 disks on
channel-1)
* File System = Ext3
* OS - Red Hat 7.2, Linux Kernel 2.4.18-lkpc-4
So here's what I got:
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
EXT3 1024 14452 92.6 14325 11.2 12192 8.5 13508 81.9 73031 19.8 673.4 4.5
intern 1*1024 52313 94.4 67747 13.4 31852 7.2 50010 81.3 89308 8.2 714.8 0.9
extern 1*1024 24031 44.4 37296 9.9 27341 7.0 52420 85.5 94305 9.5 961.2 2.1
EXT3 is the old PIII-system on jlab.org.
intern is our internal RAID 1 SCSI
extern is our external RAID 5 SCSI
Best regards
Markus
matilda matilda wrote:
> 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
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