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From: Roman Dementiev <dementiev@mpi-sb.mpg.de>
To: Andrew Morton <akpm@zip.com.au>,
	linux-kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: Multi disk performance (8 disks), limit 230 MB/s
Date: Tue, 03 Sep 2002 18:00:06 +0200	[thread overview]
Message-ID: <3D74DC86.31D0162@mpi-sb.mpg.de> (raw)
In-Reply-To: <3D7122F4.3FE3BD07@zip.com.au>

Andrew Morton wrote:

> Roman Dementiev wrote:
> >
> > 8 disks:        214 ? 229 ?       40 %           6.7 / 0.8 /10.8
> >
>
> raw access in 2.4 isn't very good - it uses 512-byte chunks.  If
> you can hunt down the `rawvary' patch that might help, but I don't
> know if it works against IDE.
>
> Testing 2.5 would be interesting ;)

I still can't run it, 'interrupt lost' ...

>
>
> Try the same test with O_DIRECT reads or writes against ext2 filesystems.
> That will use 4k blocks.

Thanx, it works. I have got 375 MB/s.

Roman



      reply	other threads:[~2002-09-03 15:56 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-08-31 18:03 Roman Dementiev
2002-08-31 20:11 ` Andrew Morton
2002-09-03 16:00   ` Roman Dementiev [this message]

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