From: Paolo Bonzini <pbonzini@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>,
Stefan Hajnoczi <stefanha@gmail.com>
Cc: Naredula Janardhana Reddy <naredula.jana@gmail.com>,
Fam Zheng <famz@redhat.com>, Ming Lei <ming.lei@canonical.com>,
Stefan Hajnoczi <stefanha@redhat.com>,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] virtio-blk multiqueue support in qemu.
Date: Mon, 13 Jul 2015 12:17:43 +0200 [thread overview]
Message-ID: <55A39047.5070806@redhat.com> (raw)
In-Reply-To: <20150709162723-mutt-send-email-mst@redhat.com>
On 09/07/2015 15:29, Michael S. Tsirkin wrote:
> > On the positive side, we do need something similar to the last 3 patches
> > to expose multiqueue to the guest. But it will require much more work
> > in QEMU to achieve true multiqueue.
>
> Might this be useful as an intermediate step, e.g. for testing
> guest code?
Yes, this is already how virtio-scsi multiqueue is implemented. The
speedup is noticeable. However, for virtio-blk there is a huge
consumption of interrupt vectors in the guest, so it doesn't scale to
multiple disks as well as virtio-scsi.
next prev parent reply other threads:[~2015-07-13 10:17 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-01 17:15 [Qemu-devel] virtio-blk multiqueue support in qemu Naredula Janardhana Reddy
2015-07-02 1:21 ` Fam Zheng
2015-07-08 14:37 ` Michael S. Tsirkin
2015-07-09 9:13 ` Stefan Hajnoczi
[not found] ` <20150709132248.GA12399@stefanha-thinkpad.redhat.com>
2015-07-09 13:29 ` Michael S. Tsirkin
2015-07-10 17:56 ` Naredula Janardhana Reddy
2015-07-13 10:04 ` Stefan Hajnoczi
2015-07-13 10:17 ` Paolo Bonzini [this message]
2015-07-13 11:21 ` Michael S. Tsirkin
2015-07-13 11:24 ` Paolo Bonzini
2015-07-13 11:41 ` Michael S. Tsirkin
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=55A39047.5070806@redhat.com \
--to=pbonzini@redhat.com \
--cc=famz@redhat.com \
--cc=ming.lei@canonical.com \
--cc=mst@redhat.com \
--cc=naredula.jana@gmail.com \
--cc=qemu-devel@nongnu.org \
--cc=stefanha@gmail.com \
--cc=stefanha@redhat.com \
/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).