linux-kernel - Re: virtio-blk: should num_vqs be limited by num_possible

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Message-ID: <20190321155746.GE31434@stefanha-x1.localdomain>
Date:   Thu, 21 Mar 2019 15:57:46 +0000
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Dongli Zhang <dongli.zhang@...cle.com>,
        Cornelia Huck <cohuck@...hat.com>, mst@...hat.com,
        virtualization@...ts.linux-foundation.org,
        linux-block@...r.kernel.org, axboe@...nel.dk,
        linux-kernel@...r.kernel.org
Subject: Re: virtio-blk: should num_vqs be limited by num_possible_cpus()?

On Wed, Mar 20, 2019 at 08:53:33PM +0800, Jason Wang wrote:
> 
> On 2019/3/19 上午10:22, Dongli Zhang wrote:
> > Hi Jason,
> > 
> > On 3/18/19 3:47 PM, Jason Wang wrote:
> > > On 2019/3/15 下午8:41, Cornelia Huck wrote:
> > > > On Fri, 15 Mar 2019 12:50:11 +0800
> > > > Jason Wang <jasowang@...hat.com> wrote:
> > option 3:
> > We should allow more vectors even the block layer would support at most
> > nr_cpu_ids queues.
> > 
> > 
> > I understand a new policy for queue-vector mapping is very helpful. I am just
> > asking the question from block layer's point of view.
> > 
> > Thank you very much!
> > 
> > Dongli Zhang
> 
> 
> Don't know much for block, cc Stefan for more idea.

Thanks for CCing me.  I don't have much input at this stage.

Stefan

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