From: Paolo Bonzini <pbonzini@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Naredula Janardhana Reddy <naredula.jana@gmail.com>,
Fam Zheng <famz@redhat.com>, Stefan Hajnoczi <stefanha@gmail.com>,
Ming Lei <ming.lei@canonical.com>,
qemu-devel@nongnu.org, Stefan Hajnoczi <stefanha@redhat.com>
Subject: Re: [Qemu-devel] virtio-blk multiqueue support in qemu.
Date: Mon, 13 Jul 2015 13:24:15 +0200 [thread overview]
Message-ID: <55A39FDF.1060800@redhat.com> (raw)
In-Reply-To: <20150713141421-mutt-send-email-mst@redhat.com>
On 13/07/2015 13:21, Michael S. Tsirkin wrote:
> > 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.
>
> Could you elaborate please? interrupt vector usage is generally
> up to the guest, so whatever the issue is might be fixable by driver
> changes alone.
Yes, but in practice neither Linux nor Windows (AFAIK) are able to share
the same vector across multiple MSIs.
Paolo
next prev parent reply other threads:[~2015-07-13 11:24 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
2015-07-13 11:21 ` Michael S. Tsirkin
2015-07-13 11:24 ` Paolo Bonzini [this message]
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=55A39FDF.1060800@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 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.