linux-kernel - Re: [RFC PATCH 2/2] block: virtio-blk: support multi virt queues per virtio-blk device

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Message-ID: <53A06475.7000308@redhat.com>
Date:	Tue, 17 Jun 2014 17:53:25 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Ming Lei <ming.lei@...onical.com>,
	Stefan Hajnoczi <stefanha@...il.com>
CC:	Jens Axboe <axboe@...nel.dk>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Michael S. Tsirkin" <mst@...hat.com>, linux-api@...r.kernel.org,
	Linux Virtualization <virtualization@...ts.linux-foundation.org>,
	Stefan Hajnoczi <stefanha@...hat.com>
Subject: Re: [RFC PATCH 2/2] block: virtio-blk: support multi virt queues
 per virtio-blk device

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
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