From: Marcelo Tosatti <mtosatti@redhat.com>
To: Anthony Liguori <aliguori@us.ibm.com>
Cc: kvm@vger.kernel.org, Avi Kivity <avi@qumranet.com>
Subject: Re: [PATCH] Avoid fragment virtio-blk transfers by copying
Date: Tue, 24 Jun 2008 16:47:32 -0300 [thread overview]
Message-ID: <20080624194732.GB12618@dmt.cnet> (raw)
In-Reply-To: <1214331384-32217-1-git-send-email-aliguori@us.ibm.com>
On Tue, Jun 24, 2008 at 01:16:24PM -0500, Anthony Liguori wrote:
> A major source of performance loss for virtio-blk has been the fact that we
> split transfers into multiple requests. This is particularly harmful if you
> have striped storage beneath your virtual machine.
>
> This patch copies the request data into a single contiguous buffer to ensure
> that we don't split requests. This improves performance from about 80 MB/sec
> to about 155 MB/sec with my fibre channel link. 185 MB/sec is what we get on
> native so this gets us pretty darn close.
>
> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Looks good.
next prev parent reply other threads:[~2008-06-24 19:49 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-24 18:16 [PATCH] Avoid fragment virtio-blk transfers by copying Anthony Liguori
2008-06-24 19:47 ` Marcelo Tosatti [this message]
2008-06-25 10:44 ` Avi Kivity
2008-06-25 15:55 ` Marcelo Tosatti
2008-06-29 9:56 ` Avi Kivity
2008-06-25 16:28 ` Anthony Liguori
2008-06-29 10:01 ` Avi Kivity
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=20080624194732.GB12618@dmt.cnet \
--to=mtosatti@redhat.com \
--cc=aliguori@us.ibm.com \
--cc=avi@qumranet.com \
--cc=kvm@vger.kernel.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