From: Andreas Mock (Andreas.Mock_at_web.de)
Date: Tue Aug 07 2007 - 08:10:23 CEST
Date: Tue, 07 Aug 2007 08:10:23 +0200 Message-Id: <1581167128@web.de> From: Andreas Mock <Andreas.Mock@web.de> Subject: Re: [suse-sles-e] Slow direct I/O performance SLES 10 SP1
> -----Ursprüngliche Nachricht-----
> Von: "Gordon Ross" <G.Ross@ccw.gov.uk>
> Gesendet: 06.08.07 19:57:41
> An: <suse-sles-e@suse.com>
> Betreff: Re: [suse-sles-e] Slow direct I/O performance SLES 10 SP1
>
> hq-hls3:~ # dd oflag=direct if=/dev/zero of=data.out bs=4k count=10000
> 10000+0 records in
> 10000+0 records out
> 40960000 bytes (41 MB) copied, 0.88554 seconds, 46.3 MB/s
>
> HP DL385G2 on internal HD controller. (SATA discs)
>
>
>
> hq-hls1:~ # dd oflag=direct if=/dev/zero of=data.out bs=4k count=10000
> 10000+0 records in
> 10000+0 records out
> 40960000 bytes (41 MB) copied, 41.4103 seconds, 989 kB/s
>
> HP DL385 on internal HD controller (SCSI HDs)
Hi Gordon, hi all,
thanks to the guys who made the test for me. It's interesting.
Gordon, could you make the test with a much bigger block count?
Isn't it really strange that you get 1MB/s on one server and
about 46.3 MB/s on the other. There must be some write buffering
on the driver side. The 1MB/s on the second server is about
what I get here.
Best regards
Andreas Mock
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