From: Kevin Wolf <kwolf@suse.de>
To: Anthony Liguori <aliguori@us.ibm.com>
Cc: kvm@vger.kernel.org
Subject: Re: [PATCH] Use qemu_memalign instead of qemu_malloc
Date: Wed, 25 Jun 2008 11:19:39 +0200 [thread overview]
Message-ID: <48620DAB.5010501@suse.de> (raw)
In-Reply-To: <1214333395-4094-1-git-send-email-aliguori@us.ibm.com>
Anthony Liguori schrieb:
> I guess the main block code is not as defensive as I thought it was. This patch
> uses qemu_memalign to allocate the buffers for IO so that you don't get errors
> when using O_DIRECT.
Actually, the block code should be able to deal with unaligned buffers
since qemu rev. 4599. This change seems to be present in current KVM.
Can you tell exactly which operation failed?
But apart from that, qemu_memalign is the right thing to do, because
copying from/into an aligned buffer in the block code costs performance
(don't know how much, though).
Kevin
next prev parent reply other threads:[~2008-06-25 9:22 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-24 18:49 [PATCH] Use qemu_memalign instead of qemu_malloc Anthony Liguori
2008-06-25 9:19 ` Kevin Wolf [this message]
2008-06-25 13:48 ` Anthony Liguori
2008-06-25 14:15 ` Kevin Wolf
2008-06-25 14:19 ` Anthony Liguori
2008-06-25 14:29 ` Kevin Wolf
2008-06-25 15:22 ` Anthony Liguori
2008-06-25 15:29 ` Kevin Wolf
2008-06-25 15:44 ` Anthony Liguori
2008-06-25 14:55 ` Laurent Vivier
2008-06-25 15:14 ` Kevin Wolf
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