From: Paul Brook <paul@codesourcery.com>
To: Jamie Lokier <jamie@shareable.org>
Cc: Kevin Wolf <kwolf@redhat.com>, Alexander Graf <agraf@suse.de>,
Christoph Hellwig <hch@lst.de>,
qemu-devel@nongnu.org, armbru@redhat.com
Subject: Re: [Qemu-devel] Re: [PATCH 2/2] Add flush=off parameter to -drive
Date: Tue, 11 May 2010 22:58:51 +0100 [thread overview]
Message-ID: <201005112258.52054.paul@codesourcery.com> (raw)
In-Reply-To: <20100511182020.GB30446@shareable.org>
> Paul Brook wrote:
> > cache=none:
> > No host caching. Reads and writes both go directly to underlying
> > storage.
> >
> > Useful to avoid double-caching.
> >
> > cache=writethrough
> >
> > Reads are cached. Writes go directly to underlying storage. Useful for
> > broken guests that aren't aware of drive caches.
>
> These are misleading descriptions - because cache=none does not push
> writes down to powerfail-safe storage, while cache=writethrough might.
If so, then this is a serious bug.
Paul
next prev parent reply other threads:[~2010-05-11 21:59 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-10 21:51 [Qemu-devel] [PATCH 0/2] Enable qemu block layer to not flush Alexander Graf
2010-05-10 21:51 ` [Qemu-devel] [PATCH 1/2] Add no-op aio emulation stub Alexander Graf
2010-05-10 21:51 ` [Qemu-devel] [PATCH 2/2] Add flush=off parameter to -drive Alexander Graf
2010-05-11 8:36 ` [Qemu-devel] " Kevin Wolf
2010-05-11 10:55 ` Christoph Hellwig
2010-05-11 12:15 ` Paul Brook
2010-05-11 12:43 ` Anthony Liguori
2010-05-11 13:12 ` Paul Brook
2010-05-11 13:20 ` Anthony Liguori
2010-05-11 13:50 ` Paul Brook
2010-05-11 15:40 ` Anthony Liguori
2010-05-11 15:53 ` Paul Brook
2010-05-11 17:09 ` Anthony Liguori
2010-05-11 22:33 ` Paul Brook
2010-05-11 19:11 ` Avi Kivity
2010-05-11 16:32 ` Jamie Lokier
2010-05-11 17:15 ` Anthony Liguori
2010-05-11 18:13 ` Jamie Lokier
2010-05-11 15:18 ` Alexander Graf
2010-05-11 18:20 ` Jamie Lokier
2010-05-11 21:58 ` Paul Brook [this message]
2010-05-11 22:11 ` Paul Brook
2010-05-12 10:09 ` Jamie Lokier
2010-05-17 12:40 ` Christoph Hellwig
2010-05-14 9:16 ` Markus Armbruster
2010-05-17 12:41 ` Christoph Hellwig
2010-05-17 12:42 ` Alexander Graf
2010-05-11 19:04 ` Avi Kivity
2010-05-12 15:05 ` Alexander Graf
2010-05-12 15:36 ` Kevin Wolf
2010-05-12 15:51 ` Alexander Graf
2010-05-11 6:18 ` [Qemu-devel] [PATCH 1/2] Add no-op aio emulation stub Stefan Hajnoczi
2010-05-11 8:29 ` [Qemu-devel] " Kevin Wolf
2010-05-10 21:59 ` [Qemu-devel] [PATCH 0/2] Enable qemu block layer to not flush Anthony Liguori
2010-05-10 22:03 ` Alexander Graf
2010-05-10 22:12 ` Anthony Liguori
2010-05-11 21:48 ` Jamie Lokier
2010-05-12 8:51 ` Stefan Hajnoczi
2010-05-12 9:42 ` Jamie Lokier
2010-05-12 10:43 ` Stefan Hajnoczi
2010-05-12 12:50 ` Jamie Lokier
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=201005112258.52054.paul@codesourcery.com \
--to=paul@codesourcery.com \
--cc=agraf@suse.de \
--cc=armbru@redhat.com \
--cc=hch@lst.de \
--cc=jamie@shareable.org \
--cc=kwolf@redhat.com \
--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).