From: Anthony Liguori <anthony@codemonkey.ws>
To: Christoph Hellwig <hch@lst.de>
Cc: Kevin Wolf <kwolf@redhat.com>, Avi Kivity <avi@redhat.com>,
Qemu-devel@nongnu.org,
Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Subject: Re: [Qemu-devel] Default cache mode
Date: Wed, 29 Jun 2011 09:13:35 -0500 [thread overview]
Message-ID: <4E0B330F.7090307@codemonkey.ws> (raw)
In-Reply-To: <20110629135059.GB15863@lst.de>
On 06/29/2011 08:50 AM, Christoph Hellwig wrote:
> 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)
Is WCE ever persisted by a disk? Would it make sense to have a
mechanism to persist the WCE setting for a guest?
Regards,
Anthony Liguori
>
next prev parent reply other threads:[~2011-06-29 14:13 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
2011-06-29 14:13 ` Anthony Liguori [this message]
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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