From: Christoph Hellwig <hch@lst.de>
To: Kevin Wolf <kwolf@redhat.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 6/6] ide: Avoid canceling IDE DMA
Date: Fri, 18 Mar 2011 12:19:41 +0100 [thread overview]
Message-ID: <20110318111941.GA25520@lst.de> (raw)
In-Reply-To: <1280846670-27063-7-git-send-email-kwolf@redhat.com>
On Tue, Aug 03, 2010 at 04:44:30PM +0200, Kevin Wolf wrote:
> Furthermore because the DMA operation is splitted into many synchronous
> aio_read/write if there's more than one entry in the SG table, without this
> patch the DMA would be cancelled in the middle, something we've no idea if it
> happens on real hardware too or not. Overall this seems a great risk for zero
> gain.
That hasn't been true for a long time when this code was commited, at least
on kernel supporting preadv/pwritev and/or aio.
next prev parent reply other threads:[~2011-03-18 11:19 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-03 14:44 [Qemu-devel] [PULL 0/6] Block patches Kevin Wolf
2010-08-03 14:44 ` [Qemu-devel] [PATCH 1/6] block: Change bdrv_commit to handle multiple sectors at once Kevin Wolf
2010-08-03 14:44 ` [Qemu-devel] [PATCH 2/6] loadvm: improve tests before bdrv_snapshot_goto() Kevin Wolf
2011-04-14 9:10 ` [Qemu-devel] [BUG] Re: [2/6] " Philipp Hahn
2011-04-14 9:29 ` Kevin Wolf
2011-08-09 22:35 ` [Qemu-devel] [libvirt] " Eric Blake
2010-08-03 14:44 ` [Qemu-devel] [PATCH 3/6] block migration: replace tabs by spaces Kevin Wolf
2010-08-03 14:44 ` [Qemu-devel] [PATCH 4/6] block: Fix bdrv_has_zero_init Kevin Wolf
2010-08-03 14:44 ` [Qemu-devel] [PATCH 5/6] block: Change bdrv_eject() not to drop the image Kevin Wolf
2010-08-03 14:44 ` [Qemu-devel] [PATCH 6/6] ide: Avoid canceling IDE DMA Kevin Wolf
2011-03-18 11:19 ` Christoph Hellwig [this message]
2011-03-18 11:34 ` Kevin Wolf
2011-03-18 14:10 ` Christoph Hellwig
2010-08-09 13:41 ` [Qemu-devel] [PULL 0/6] Block patches 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=20110318111941.GA25520@lst.de \
--to=hch@lst.de \
--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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.