From: Anthony Liguori <anthony@codemonkey.ws>
To: Kevin Wolf <kwolf@redhat.com>
Cc: Avi Kivity <avi@redhat.com>, Christoph Hellwig <hch@lst.de>,
Qemu-devel@nongnu.org,
Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Subject: Re: [Qemu-devel] Default cache mode
Date: Wed, 29 Jun 2011 07:06:03 -0500 [thread overview]
Message-ID: <4E0B152B.1000201@codemonkey.ws> (raw)
In-Reply-To: <4E0B1399.4050807@redhat.com>
On 06/29/2011 06:59 AM, Kevin Wolf wrote:
> Hi,
>
> I think we have touched this topic before during some IRC discussions or
> somewhere deep in a mailing list thread, but I think it hasn't been
> discussed on the list.
>
> Our default cache mode of cache=writethrough is extremely conservative
> and provides absolute safety at the cost of performance,
But for the most part, we track bare metal fairly well in terms of block
performance, no?
Or are you really referring to qcow2 as a specific example? In the
past, we used a different default caching mode for qcow2. I think that
could be done again if there was a compelling reason.
Regards,
Anthony Liguori
next prev parent reply other threads:[~2011-06-29 12:06 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-29 11:59 [Qemu-devel] Default cache mode Kevin Wolf
2011-06-29 12:06 ` Anthony Liguori [this message]
2011-06-29 12:16 ` Kevin Wolf
2011-06-29 12:23 ` Anthony Liguori
2011-06-29 12:32 ` Kevin Wolf
2011-06-29 13:51 ` Christoph Hellwig
2011-06-29 14:17 ` Michael Tokarev
2011-06-29 14:50 ` Christoph Hellwig
2011-06-29 15:07 ` Michael Tokarev
2011-06-29 13:50 ` Christoph Hellwig
2011-06-29 14:13 ` Anthony Liguori
2011-06-29 14:47 ` Christoph Hellwig
2011-06-29 16:03 ` Stefan Hajnoczi
2011-06-29 13:53 ` Frediano Ziglio
2011-06-29 14:11 ` Kevin Wolf
2011-06-29 14:12 ` Christoph Hellwig
2011-06-29 14:21 ` Kevin Wolf
2011-06-29 13:49 ` Christoph Hellwig
2011-06-29 12:08 ` Anthony Liguori
2011-06-29 13:55 ` Christoph Hellwig
2011-06-29 14:20 ` Anthony Liguori
2011-06-29 14:52 ` Christoph Hellwig
2011-06-29 15:26 ` Anthony Liguori
2011-06-29 12:21 ` Alexander Graf
2011-06-29 13:57 ` Stefan Hajnoczi
2011-06-29 14:05 ` Alexander Graf
2011-06-29 12:52 ` Stefan Hajnoczi
2011-06-29 13:56 ` Christoph Hellwig
2011-06-29 13:00 ` Avi Kivity
2011-06-29 13:05 ` Anthony Liguori
2011-06-29 13:30 ` Avi Kivity
2011-06-29 13:11 ` Kevin Wolf
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