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

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Message-Id: <ABA117F8-58AA-40EC-B3DA-4AB000A72BAD@smartx.com>
Date:   Thu, 7 Dec 2023 14:32:43 +0800
From:   Li Feng <fengli@...rtx.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>,
        "Michael S. Tsirkin" <mst@...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 Dec 7, 2023, at 14:02, Jason Wang <jasowang@...hat.com> wrote:
> 
> On Thu, Dec 7, 2023 at 12:33 PM Li Feng <fengli@...rtx.com> wrote:
>> 
>> virtio-blk is generally used in cloud computing scenarios, where the
>> performance of virtual disks is very important. The mq-deadline scheduler
>> has a big performance drop compared to none with single queue.
> 
> At least you can choose the scheduler based on if mq is supported or not?
> 
> Thanks
> 
The "none" scheduler has better performance regardless of whether it is
a single queue or multiple queues. Why not set the single queue scheduler
to none by default?

Thanks.