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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4BF53AEE.10207@redhat.com \
--to=jes.sorensen@redhat.com \
--cc=aliguori@us.ibm.com \
--cc=anthony@codemonkey.ws \
--cc=crobinso@redhat.com \
--cc=hch@infradead.org \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).