From: Jes Sorensen <Jes.Sorensen@redhat.com>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: hch@infradead.org, aliguori@us.ibm.com, qemu-devel@nongnu.org,
crobinso@redhat.com
Subject: Re: [Qemu-devel] [PATCH] QEMU: change default disk cache behavior
Date: Thu, 20 May 2010 15:36:46 +0200 [thread overview]
Message-ID: <4BF53AEE.10207@redhat.com> (raw)
In-Reply-To: <4BF52B64.1020903@codemonkey.ws>
On 05/20/10 14:30, Anthony Liguori wrote:
> On 05/20/2010 04:32 AM, Jes.Sorensen@redhat.com wrote:
>> Therefore, here is a patch that does two things:
>> - default to "nocache"
>> - in case of failure with nocache, retry with "write-back"
>>
>
> This sort of change requires performance data in a variety of
> circumstances to justify.
>
> And I strongly suspect that such a blanket change would be wrong but
> that a more targeted change like making cache=none default for physical
> devices would satisfy mostly everyone.
Is there any other thing than physical devices attached to the -drive
parameter?
If so, I can take a look at making it more generic when I am back from
holiday next week.
Jes
next prev parent reply other threads:[~2010-05-20 13:37 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-20 9:32 [Qemu-devel] [PATCH] QEMU: change default disk cache behavior Jes.Sorensen
2010-05-20 9:32 ` [Qemu-devel] [PATCH] QEMU: Change default disk caching to nocache Jes.Sorensen
2010-05-20 15:24 ` [Qemu-devel] " Paolo Bonzini
2010-05-20 18:56 ` Anthony Liguori
2010-05-20 12:30 ` [Qemu-devel] [PATCH] QEMU: change default disk cache behavior Anthony Liguori
2010-05-20 13:36 ` Jes Sorensen [this message]
2010-05-20 13:40 ` Anthony Liguori
2010-05-20 13:49 ` Jes Sorensen
2010-05-20 14:05 ` Stefan Hajnoczi
2010-05-20 18:58 ` Anthony Liguori
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