From: Jeff Dike <jdike@addtoit.com>
To: Chris Lightfoot <chris@ex-parrot.com>
Cc: user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] UBD performance
Date: Sun, 9 Oct 2005 21:35:15 -0400 [thread overview]
Message-ID: <20051010013515.GB10677@ccure.user-mode-linux.org> (raw)
In-Reply-To: <Nrn3QE48asne.DeHnFPPg9WBURzpIZbOgOA@sphinx.mythic-beasts.com>
On Sun, Oct 09, 2005 at 11:51:28PM +0100, Chris Lightfoot wrote:
> (TBH I'm surprised that the AIO code shows so little
> improvement. The kernel does report that it's using 2.6
> host AIO, so it is using the new version. Obviously
> issuing the writes segment-by-segment is non-ideal but I'm
> surprised it's this bad. Could I be missing some
> configuration step?)
Make sure you've got the o_direct patch, and are using a 4K block filesystem.
If you're not doing O_DIRECT, then io_getevents waits - i.e. it's synchronous.
Jeff
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next prev parent reply other threads:[~2005-10-10 1:42 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-08 16:32 [uml-devel] UBD performance Chris Lightfoot
2005-10-09 8:49 ` [uml-devel] " Chris Lightfoot
2005-10-09 18:45 ` [uml-devel] " Jeff Dike
2005-10-09 22:51 ` Chris Lightfoot
2005-10-10 1:35 ` Jeff Dike [this message]
2005-10-10 9:10 ` Chris Lightfoot
2005-10-10 14:38 ` Jeff Dike
2005-10-10 15:44 ` Chris Lightfoot
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