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

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Message-Id: <9679B268-5BD7-4731-86CC-6B5CF7CE2DF2@smartx.com>
Date: Thu, 28 Dec 2023 15:25:10 +0800
From: Li Feng <fengli@...rtx.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>,
 Jens Axboe <axboe@...nel.dk>,
 Jason Wang <jasowang@...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 27, 2023, at 18:06, Michael S. Tsirkin <mst@...hat.com> wrote:
> 
> On Wed, Dec 27, 2023 at 03:26:30PM +0800, Li Feng wrote:
>> 
>> 
>>> 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.
> 
> Maybe. I think it would be up to you to prove this then.
Ok.

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