From: Jens Axboe <axboe@suse.de>
To: Philip R Auld <pauld@egenera.com>
Cc: Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk>,
Xen development list <xen-devel@lists.xensource.com>,
Kurt Garloff <garloff@suse.de>, Vincent Hanquez <tab@snarc.org>,
Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Subject: Re: poor domU VBD performance.
Date: Thu, 31 Mar 2005 20:01:52 +0200 [thread overview]
Message-ID: <20050331180151.GT9204@suse.de> (raw)
In-Reply-To: <20050331165305.GA13875@vienna.egenera.com>
On Thu, Mar 31 2005, Philip R Auld wrote:
> > > This effects merging though, right? I don't think the the front
> > > end has done any merging.
> >
> > The noop elevator does front and back merging.
> > My understanding is that it's used in the frontend driver.
>
> If that is the case, it can only merge things that are
> machine contiguous. Current guests know this mapping, but
> can they get this when running unmodified with VT-x.
>
> My experience showed very little if any multipage
> IO coming out of the front end.
There aren't that many users of multipage ios yet. direct io will use
it, ext2 will as well. iirc, -mm has patches for ext3 too. so it's
definitely improving :-)
--
Jens Axboe
next prev parent reply other threads:[~2005-03-31 18:01 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-30 11:16 RE: RE: poor domU VBD performance Ian Pratt
2005-03-30 17:01 ` peter bier
2005-03-30 18:05 ` Andrew Theurer
2005-03-31 7:05 ` RE: " Jens Axboe
2005-03-31 7:10 ` Jens Axboe
2005-03-31 8:17 ` Keir Fraser
2005-03-31 8:19 ` Jens Axboe
2005-03-31 14:33 ` Philip R Auld
2005-03-31 15:34 ` Kurt Garloff
2005-03-31 15:39 ` Jens Axboe
2005-03-31 15:41 ` Jens Axboe
2005-03-31 16:27 ` Nivedita Singhvi
2005-03-31 17:43 ` Jens Axboe
2005-03-31 18:27 ` Kurt Garloff
2005-03-31 21:59 ` Nivedita Singhvi
2005-03-31 15:49 ` Keir Fraser
2005-03-31 16:02 ` Andrew Theurer
2005-03-31 17:44 ` Jens Axboe
2005-03-31 16:55 ` Philip R Auld
2005-03-31 16:53 ` Philip R Auld
2005-03-31 18:01 ` Jens Axboe [this message]
2005-03-31 18:43 ` Philip R Auld
2005-03-31 19:07 ` Keir Fraser
2005-03-31 19:10 ` Keir Fraser
2005-03-31 19:20 ` Jens Axboe
2005-03-31 19:21 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2005-04-04 19:36 Ian Pratt
2005-04-04 22:35 ` Nicholas Lee
2005-04-12 10:29 ` peter bier
2005-04-02 10:56 Ian Pratt
2005-04-02 12:10 ` Cédric Schieli
2005-04-01 23:22 Ian Pratt
2005-04-02 10:36 ` Cédric Schieli
2005-04-02 19:54 ` peter bier
2005-03-31 22:36 Ian Pratt
2005-03-31 23:05 ` Andrew Theurer
2005-04-01 21:40 ` Cédric Schieli
2005-03-31 21:32 Ian Pratt
2005-03-31 22:13 ` Andrew Theurer
2005-03-31 17:55 Ian Pratt
2005-03-31 18:04 ` Jens Axboe
2005-03-31 18:57 ` Keir Fraser
2005-03-31 19:22 ` Jens Axboe
2005-03-31 20:49 ` Andrew Theurer
2005-03-31 21:15 ` Keir Fraser
2005-03-31 21:27 ` Andrew Theurer
2005-04-01 5:43 ` Jens Axboe
2005-04-01 16:36 ` peter bier
[not found] <A95E2296287EAD4EB592B5DEEFCE0E9D1E3905@liverpoolst.ad.cl.cam.ac.uk>
2005-03-29 22:45 ` RE: " Kurt Garloff
2005-03-29 22:59 ` Andrew Theurer
2005-03-29 23:19 ` Kurt Garloff
2005-03-29 23:26 ` Andrew Theurer
2005-03-29 14:19 Ian Pratt
2005-03-29 15:27 ` peter bier
2005-03-28 22:17 Ian Pratt
2005-03-29 8:44 ` peter bier
2005-03-28 20:14 Ian Pratt
2005-03-28 20:18 ` Andrew Theurer
2005-03-28 21:48 ` Andrew Theurer
2005-03-28 23:38 ` Peter Bier
2005-03-29 0:27 ` Andrew Theurer
2005-03-29 11:39 ` peter bier
2005-03-28 18:55 Ian Pratt
2005-03-28 19:33 ` Andrew Theurer
2005-03-27 17:41 Ian Pratt
2005-03-28 8:48 ` peter bier
2005-03-28 12:44 ` peter bier
2005-03-29 6:20 ` Pasi Kärkkäinen
2005-03-26 18:14 Peter Bier
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