linux-kernel - Re: [PATCH] virtio_blk: set the default scheduler to none

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Message-ID: <CAHckoCyBxHd6Lc8UPh_3urSHz_eDj6jrm+c80+wKBmypzjvz+A@mail.gmail.com>
Date: Tue, 26 Dec 2023 20:14:13 +0800
From: Li Feng <fengli@...rtx.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: Jens Axboe <axboe@...nel.dk>, Jason Wang <jasowang@...hat.com>, 
	Paolo Bonzini <pbonzini@...hat.com>, Stefan Hajnoczi <stefanha@...hat.com>, 
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
	"open list:BLOCK LAYER" <linux-block@...r.kernel.org>, linux-kernel <linux-kernel@...r.kernel.org>, 
	"open list:VIRTIO BLOCK AND SCSI DRIVERS" <virtualization@...ts.linux.dev>
Subject: Re: [PATCH] virtio_blk: set the default scheduler to none

On Tue, Dec 26, 2023 at 5:05 PM Michael S. Tsirkin <mst@...hat.com> wrote:
>
> On Tue, Dec 26, 2023 at 05:01:40PM +0800, Li Feng wrote:
> > Hi MST and paolo,
> >
> > mq-deadline is good for slow media, and none is good for high-speed media.
> > It depends on how the community views this issue. When virtio-blk adopts
> > multi-queue,it automatically changes from deadline to none, which is not
> > uniform here.
>
> It's not virtio-blk changing though, it's linux doing that, right?
> Is virtio-blk special somehow?
>
Yes, it’s the common code path.

Each block driver has a chance to set the default none scheduler, like loop,
it has set the none as the default scheduler.

https://lkml.kernel.org/stable/20230809103647.895397540@linuxfoundation.org/

> > I don't have ideas right now to answer Christoph/Paolo's question.
> >
> > Thanks,
> > Li
>
> --
> MST
>