From: Richard Scobie <richard@sauce.co.nz>
To: Michal Soltys <soltys@ziu.info>
Cc: Ben Martin <monkeyiq@users.sourceforge.net>, linux-raid@vger.kernel.org
Subject: Re: Benchmarks: Linux Kernel RAID vs a Hardware RAID setup
Date: Wed, 16 Jul 2008 08:34:47 +1200 [thread overview]
Message-ID: <487D09E7.1010805@sauce.co.nz> (raw)
In-Reply-To: <487CC660.9030004@ziu.info>
Michal Soltys wrote:
> Also looking back at other benchmarks, stripe_cache_size can have pretty
> tremendous effect on md raid performance. There're other settings that
> could matter as well (read ahead, queue depths). It would be interesting
> to see e.g. raid5 256k chunk comparison, done with those altered (
> _especially_ md's stripe_cache_size with some high value like 16384 or
> 32768), and with stripe-width used in ext3 case (if it wasn't used
> already).
Agreed. On a 16 SATA drive SAS attached md RAID6, large streaming write
performance goes from around 110MB/s with the default stripe_cache_size,
to 600MB/s using 16384.
There are major read performance too, setting readahead on the md device
to 65536.
Regards,
Richard
next prev parent reply other threads:[~2008-07-15 20:34 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-15 14:06 Benchmarks: Linux Kernel RAID vs a Hardware RAID setup Ben Martin
2008-07-15 14:42 ` Justin Piszcz
2008-07-16 4:14 ` Ben Martin
2008-07-15 15:46 ` Michal Soltys
2008-07-15 20:34 ` Richard Scobie [this message]
2008-07-16 2:34 ` Mr. James W. Laferriere
2008-07-16 2:48 ` Richard Scobie
2008-07-16 2:52 ` Mr. James W. Laferriere
2008-07-16 4:17 ` Keld Jørn Simonsen
2008-07-16 5:50 ` Michal Soltys
2008-07-16 3:36 ` Ben Martin
2008-07-16 3:55 ` Richard Scobie
2008-07-16 7:00 ` Dan Williams
2008-07-16 17:08 ` thomas62186218
2008-07-16 19:34 ` Richard Scobie
2008-07-15 16:39 ` Keld Jørn Simonsen
2008-07-15 16:50 ` thomas62186218
2008-07-15 17:39 ` Keld Jørn Simonsen
2008-07-16 0:01 ` Richard Scobie
2008-07-16 0:20 ` Jon Nelson
2008-07-16 4:06 ` Ben Martin
2008-07-16 15:42 ` Ben Martin
2008-07-16 4:23 ` Keld Jørn Simonsen
2008-07-16 5:18 ` Richard Scobie
2008-07-16 8:17 ` Keld Jørn Simonsen
2008-07-15 17:06 ` Jon Nelson
2008-07-16 3:44 ` Ben Martin
2008-07-15 18:40 ` Brad Campbell
2008-07-15 20:12 ` Keld Jørn Simonsen
2008-07-21 16:55 ` Bill Davidsen
2008-07-23 7:45 ` Keld Jørn Simonsen
2008-07-23 10:29 ` Brad Campbell
[not found] ` <487CF499.6080105@harddata.com>
2008-07-15 20:15 ` Keld Jørn Simonsen
2008-07-16 3:58 ` Ben Martin
2008-07-16 4:47 ` Keld Jørn Simonsen
2008-07-21 16:58 ` Bill Davidsen
2008-07-15 19:41 ` Keld Jørn Simonsen
2008-07-16 3:25 ` Ben Martin
2008-07-15 20:40 ` Peter Grandi
2008-07-16 3:38 ` Eric Sandeen
2008-07-16 18:54 ` Alan D. Brunelle
2008-07-17 8:26 ` Ben Martin
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