From: Christoph Hellwig <hch@lst.de>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Kevin Wolf <kwolf@redhat.com>, 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 15:50:59 +0200 [thread overview]
Message-ID: <20110629135059.GB15863@lst.de> (raw)
In-Reply-To: <4E0B1943.4090400@codemonkey.ws>
On Wed, Jun 29, 2011 at 07:23:31AM -0500, Anthony Liguori wrote:
> Which file system on the host?
Any filesystem. Although extN and btrfs are particularly bad.
> At any rate, I'm a big fan of making wce tunable in the guest and then I
> think setting wce=1 is quite reasonable to do by default.
Note that this means a manual override during each boot. Windows and
modern Linux just use what's available. Only Solaris with ZFS actually
turns WCE on if it's not set AFAIK. And to me it's a rather questionable
behaviour at least for SCSI disks where the admin might have chosen
those intentionally. (unlike ATA disks SCSI allows to store the setting
permanently)
next prev parent reply other threads:[~2011-06-29 13:51 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
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 [this message]
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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