From: Paolo Bonzini <pbonzini@redhat.com>
To: Ming Lei <ming.lei@canonical.com>, Stefan Hajnoczi <stefanha@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>,
"Michael S. Tsirkin" <mst@redhat.com>,
linux-api@vger.kernel.org,
linux-kernel <linux-kernel@vger.kernel.org>,
Linux Virtualization <virtualization@lists.linux-foundation.org>,
Stefan Hajnoczi <stefanha@redhat.com>
Subject: Re: [RFC PATCH 2/2] block: virtio-blk: support multi virt queues per virtio-blk device
Date: Tue, 17 Jun 2014 17:53:25 +0200 [thread overview]
Message-ID: <53A06475.7000308@redhat.com> (raw)
In-Reply-To: <CACVXFVO0SybUKArQbKkj2+hbk6q_gt3SBooNNmw1jErRR8d07A@mail.gmail.com>
Il 17/06/2014 17:50, Ming Lei ha scritto:
>> > It would be nice to allocate virtqueues dynamically instead of
>> > hardcoding the limit. virtio-scsi also allocates virtqueues
>> > dynamically.
> virtio-scsi may have lots of LUN, but virtio-blk only has one disk
> which needn't lots of hardware queues.
If you want to do queue steering based on the guest VCPU number, the
number of queues must be = to the number of VCPUs shouldn't it?
I tried using a divisor of the number of VCPUs, but couldn't get the
block layer to deliver interrupts to the right VCPU.
Paolo
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Ming Lei <ming.lei@canonical.com>, Stefan Hajnoczi <stefanha@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-kernel <linux-kernel@vger.kernel.org>,
"Michael S. Tsirkin" <mst@redhat.com>,
linux-api@vger.kernel.org,
Linux Virtualization <virtualization@lists.linux-foundation.org>,
Stefan Hajnoczi <stefanha@redhat.com>
Subject: Re: [RFC PATCH 2/2] block: virtio-blk: support multi virt queues per virtio-blk device
Date: Tue, 17 Jun 2014 17:53:25 +0200 [thread overview]
Message-ID: <53A06475.7000308@redhat.com> (raw)
In-Reply-To: <CACVXFVO0SybUKArQbKkj2+hbk6q_gt3SBooNNmw1jErRR8d07A@mail.gmail.com>
Il 17/06/2014 17:50, Ming Lei ha scritto:
>> > It would be nice to allocate virtqueues dynamically instead of
>> > hardcoding the limit. virtio-scsi also allocates virtqueues
>> > dynamically.
> virtio-scsi may have lots of LUN, but virtio-blk only has one disk
> which needn't lots of hardware queues.
If you want to do queue steering based on the guest VCPU number, the
number of queues must be = to the number of VCPUs shouldn't it?
I tried using a divisor of the number of VCPUs, but couldn't get the
block layer to deliver interrupts to the right VCPU.
Paolo
next prev parent reply other threads:[~2014-06-17 15:53 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-13 17:29 [RFC PATCH 0/2] block: virtio-blk: support multi vq per virtio-blk Ming Lei
2014-06-13 17:29 ` Ming Lei
2014-06-13 17:29 ` [RFC PATCH 1/2] include/uapi/linux/virtio_blk.h: introduce feature of VIRTIO_BLK_F_MQ Ming Lei
2014-06-13 17:29 ` Ming Lei
2014-06-16 12:42 ` Rusty Russell
[not found] ` <1402680562-8328-2-git-send-email-ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>
2014-06-16 12:42 ` Rusty Russell
2014-06-16 12:42 ` Rusty Russell
2014-06-13 17:29 ` [RFC PATCH 2/2] block: virtio-blk: support multi virt queues per virtio-blk device Ming Lei
2014-06-13 17:29 ` Ming Lei
[not found] ` <1402680562-8328-3-git-send-email-ming.lei-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>
2014-06-16 12:47 ` Rusty Russell
2014-06-16 12:47 ` Rusty Russell
2014-06-16 12:47 ` Rusty Russell
2014-06-17 2:40 ` Stefan Hajnoczi
2014-06-17 2:40 ` Stefan Hajnoczi
[not found] ` <CAJSP0QWaS--gPZ=ONFrXby1DQLw4R0RCro7bpHCdmucyjmqT_w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-06-17 15:50 ` Ming Lei
2014-06-17 15:50 ` Ming Lei
2014-06-17 15:53 ` Paolo Bonzini [this message]
2014-06-17 15:53 ` Paolo Bonzini
2014-06-17 16:00 ` Ming Lei
2014-06-17 16:00 ` Ming Lei
2014-06-17 16:34 ` Paolo Bonzini
2014-06-17 16:34 ` Paolo Bonzini
[not found] ` <53A06E05.9060708-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2014-06-18 4:04 ` Ming Lei
2014-06-18 4:04 ` Ming Lei
2015-12-14 10:31 ` Paolo Bonzini
[not found] ` <CACVXFVMkV5R5GUjM7Y-U54SA-ENZZ26dbbv4K2_OYPdmmiuUqg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-12-14 10:31 ` Paolo Bonzini
2015-12-14 10:31 ` Paolo Bonzini
[not found] ` <566E9A7E.3030203-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-12-15 1:26 ` Ming Lei
2015-12-15 1:26 ` Ming Lei
2015-12-15 1:26 ` Ming Lei
2014-06-18 4:04 ` Ming Lei
2014-06-17 15:50 ` Ming Lei
2014-06-13 17:35 ` [RFC PATCH 0/2] block: virtio-blk: support multi vq per virtio-blk Jens Axboe
2014-06-13 17:35 ` Jens Axboe
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=53A06475.7000308@redhat.com \
--to=pbonzini@redhat.com \
--cc=axboe@kernel.dk \
--cc=linux-api@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=ming.lei@canonical.com \
--cc=mst@redhat.com \
--cc=stefanha@gmail.com \
--cc=stefanha@redhat.com \
--cc=virtualization@lists.linux-foundation.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.