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Subject: Re: [PATCH] virtio_blk: set the default scheduler to none
From: Li Feng <fengli@smartx.com>
In-Reply-To: <20231226103743-mutt-send-email-mst@kernel.org>
Date: Wed, 27 Dec 2023 15:26:30 +0800
Cc: Jens Axboe <axboe@kernel.dk>,
 Jason Wang <jasowang@redhat.com>,
 Paolo Bonzini <pbonzini@redhat.com>,
 Stefan Hajnoczi <stefanha@redhat.com>,
 Xuan Zhuo <xuanzhuo@linux.alibaba.com>,
 "open list:BLOCK LAYER" <linux-block@vger.kernel.org>,
 linux-kernel <linux-kernel@vger.kernel.org>,
 "open list:VIRTIO BLOCK AND SCSI DRIVERS" <virtualization@lists.linux.dev>
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References: <20231207043118.118158-1-fengli@smartx.com>
 <20231225092010-mutt-send-email-mst@kernel.org>
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 <20231226103743-mutt-send-email-mst@kernel.org>
To: "Michael S. Tsirkin" <mst@redhat.com>,
 Paolo Bonzini <pbonzini@redhat.com>


> On Dec 26, 2023, at 23:38, Michael S. Tsirkin <mst@redhat.com> wrote:
>=20
> 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.
>=20
> 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=20=

caused by other problems (such as test fluctuations) rather than the =
benefits=20
brought by deadline.=20

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

Thanks,
Li

>=20
> --=20
> MST
>=20