From: Anthony Liguori <aliguori@us.ibm.com>
To: Ryan Harper <ryanh@us.ibm.com>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: [Qemu-devel] Re: [PATCH 0/3] Refactor AIO to allow multiple AIO implementations
Date: Tue, 23 Sep 2008 09:47:17 -0500 [thread overview]
Message-ID: <48D90175.1010009@us.ibm.com> (raw)
In-Reply-To: <20080923144319.GM31395@us.ibm.com>
Ryan Harper wrote:
> * Anthony Liguori <aliguori@us.ibm.com> [2008-09-22 22:44]:
>
>> Can you run the same performance tests with the following patches (using
>> sync=on instead of cache=off)?
>>
>> You'll need my aio_init fix too. I suspect this will give equally good
>> performance to your patch set. That's not saying your patch set isn't
>> useful, but I would like to get performance to be better for the case
>> that we're going through the page cache.
>>
>
> I can run the test, but it is orthogonal to the patchset which is
> focused on using O_DIRECT and linux-aio.
>
Yes, I'm trying to understand where the performance is coming from. The
hunch is that supporting multiple simultaneous requests along is what
did it. O_SYNC should give similar completion behavior to O_DIRECT.
Regards,
Anthony Liguori
next prev parent reply other threads:[~2008-09-23 14:49 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-22 23:17 [PATCH 0/3] Refactor AIO to allow multiple AIO implementations Ryan Harper
2008-09-22 23:17 ` [PATCH 1/3] Only call aio flush handler if set Ryan Harper
2008-09-23 2:38 ` Anthony Liguori
2008-09-23 14:26 ` [Qemu-devel] " Ryan Harper
2008-09-23 14:34 ` Anthony Liguori
2008-09-23 14:41 ` Ryan Harper
2008-09-23 14:50 ` Anthony Liguori
2008-09-22 23:17 ` [PATCH 2/3] Move aio implementation out of raw block driver Ryan Harper
2008-09-23 1:16 ` Ryan Harper
2008-09-23 2:45 ` Anthony Liguori
2008-09-23 14:39 ` [Qemu-devel] " Ryan Harper
2008-09-23 14:40 ` Anthony Liguori
2008-09-23 14:53 ` Gerd Hoffmann
2008-09-23 16:06 ` Anthony Liguori
2008-09-23 18:04 ` Gerd Hoffmann
2008-09-23 18:28 ` Anthony Liguori
2008-09-24 22:31 ` Marcelo Tosatti
[not found] ` <1222125454-21744-4-git-send-email-ryanh@us.ibm.com>
2008-09-23 1:22 ` [PATCH 3/3] Add linux aio implementation for raw block devices Ryan Harper
2008-09-23 3:32 ` [PATCH 0/3] Refactor AIO to allow multiple AIO implementations Anthony Liguori
2008-09-23 14:43 ` [Qemu-devel] " Ryan Harper
2008-09-23 14:47 ` Anthony Liguori [this message]
2008-09-23 16:09 ` Anthony Liguori
2008-09-23 10:27 ` [Qemu-devel] " Jamie Lokier
2008-10-02 22:41 ` john cooper
2008-10-03 13:33 ` Ryan Harper
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