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

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Date: Wed, 27 Dec 2023 15:26:30 +0800
From: Li Feng <fengli@...rtx.com>
To: "Michael S. Tsirkin" <mst@...hat.com>,
 Paolo Bonzini <pbonzini@...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 Dec 26, 2023, at 23:38, Michael S. Tsirkin <mst@...hat.com> wrote:
> 
> On Tue, Dec 26, 2023 at 05:01:40PM +0800, Li Feng wrote:
>> I don't have ideas right now to answer Christoph/Paolo's question.
> 
> Paolo did some testing on this thread and posted some concerns.
> Do you disagree with his analysis?

Paolo gave a very detailed data analysis. Indeed, in some low queue depth
scenarios, the data dropped somewhat. However, I suspect that it may be 
caused by other problems (such as test fluctuations) rather than the benefits 
brought by deadline. 

BTW, I think 128 queue depth test is a very important and common performance
test item for storage devices.

Thanks,
Li

> 
> -- 
> MST
>