From: Nicolas Boullis <nicolas.boullis@ecp.fr>
To: Jeff Dike <jdike@addtoit.com>,
user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] parallel I/O
Date: Mon, 06 Oct 2008 15:28:37 +0200 [thread overview]
Message-ID: <48EA1285.9050806@ecp.fr> (raw)
In-Reply-To: <20081004183731.cajymruq1vwocwks@webmail.ecp.fr>
Hi,
Nicolas Boullis wrote:
> On a reasonably new host, using as UBD devices logical volumes built
> on top of a FC SAN, building a 10GB ext3 filesystem took something
> like 50 seconds before my patch, and something like 3 seconds after
> it. (I can check the exact values if you wish.)
Hmmm... my memory was making thing much better than they really are.
It's around 38 seconds with 2.6.18 (before the "batch I/O requests"
change); it's several minutes with unpatched 2.6.24, and it's around 7
seconds with patched 2.6.24...
To be more honnest, my patch contains a part similar to Steve
VanDeBogart's "ubd does multiple io's when one will suffice" patch.
Using 2.6.24 with his patch but still serialized I/O, the time is around
23 seconds.
Hence, my patch (with 16 threads per device) make things around 3 times
faster.
Cheers,
Nicolas Boullis
École Centrale Paris
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prev parent reply other threads:[~2008-10-06 13:31 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-12 13:40 [uml-devel] parallel I/O Nicolas Boullis
2008-09-15 8:59 ` Nicolas Boullis
2008-10-02 13:34 ` Nicolas Boullis
2008-10-04 4:28 ` Jeff Dike
2008-10-04 16:37 ` Nicolas Boullis
2008-10-06 13:28 ` Nicolas Boullis [this message]
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