From: Troy Benjegerdes <hozer@hozed.org>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [patch] non-blocking disk IO
Date: Tue, 4 Oct 2005 00:24:51 -0500 [thread overview]
Message-ID: <20051004052451.GJ4612@kalmia.hozed.org> (raw)
In-Reply-To: <Pine.LNX.4.61.0510040541180.13658@filer.marasystems.com>
>
> If you anyway plan on having Posix AIO support then go for the Posix AIO
> interface. The performance reasons why Linux AIO exists is very unlikely
> to be an issue to qemu as you need to be quite I/O intensive to see any
> performance difference.
Ideally, we should be able to use a Posix AIO support libary that uses
native Linux AIO underneath.
What we want is to be able to have the guest OS request some DMA
I/O operation, and have qemu be able to use AIO so that the actual disk
hardware can dump the data directly in the pages the userspace process
on the guest OS ends up wanting it in, avoiding several expensive memcopy
and context switch operations.
next prev parent reply other threads:[~2005-10-04 5:27 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-03 6:49 [Qemu-devel] [patch] non-blocking disk IO John Coiner
2005-10-03 7:09 ` Magnus Damm
2005-10-03 9:57 ` Elefterios Stamatogiannakis
2005-10-03 12:58 ` Christian MICHON
2005-10-04 7:17 ` John Coiner
2005-10-04 7:46 ` Christian MICHON
2005-10-04 8:52 ` Elefterios Stamatogiannakis
2005-10-04 9:35 ` Christian MICHON
2005-10-04 11:19 ` Christian MICHON
2005-10-04 12:22 ` Jens Axboe
2005-10-04 13:14 ` John Coiner
2005-10-04 13:20 ` Christian MICHON
2005-10-03 13:58 ` Jens Axboe
2005-10-03 22:29 ` John Coiner
2005-10-04 6:41 ` Jens Axboe
2005-10-04 1:35 ` Troy Benjegerdes
2005-10-04 3:25 ` John Coiner
2005-10-04 3:49 ` Henrik Nordstrom
2005-10-04 5:24 ` Troy Benjegerdes [this message]
2005-10-04 6:44 ` Jens Axboe
2005-10-03 18:33 ` Fabrice Bellard
2005-10-04 20:40 ` Brad Campbell
2005-10-04 23:03 ` John Coiner
2005-10-05 11:27 ` Brad Campbell
2005-10-05 14:28 ` Troy Benjegerdes
2005-11-28 22:41 ` Ryan Rempel
-- strict thread matches above, loose matches on Subject: below --
2005-10-03 12:41 John Coiner
2005-10-04 1:34 ` Troy Benjegerdes
2005-10-04 3:16 ` John Coiner
2005-10-04 14:26 ` Troy Benjegerdes
2005-10-04 22:11 ` John Coiner
2005-10-05 3:17 ` Troy Benjegerdes
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