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Re: Question about performance comparison between virtio-fs and virtio-b
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From: |
Stefan Hajnoczi |
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Subject: |
Re: Question about performance comparison between virtio-fs and virtio-blk |
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Date: |
Tue, 26 Jul 2022 08:55:38 -0400 |
On Tue, 26 Jul 2022 at 08:24, Hao Xu <hao.xu@linux.dev> wrote:
> I watched your presentation about virtiofs in 2020,
>
> https://www.youtube.com/watch?v=EIVOzTsGMMI&t=232s
>
> which is really helpful to me, but I have a question about the graph at
> 3:53, could you give
>
> me more info about the test, like what tool you use for the test, if
> it's fio, what is the parameters.
>
> I used fio to do randread test in a qemu box, but turns out the iops of
> virtio-blk and virtio-fs are similar.
I have CCed Vivek Goyal, who has done more virtiofs benchmarking and
might have ideas to share.
The benchmarking tool was fio with the stated blocksize and I/O
pattern. The benchmark was probably run with direct=1. Based on the
virtio-blk numbers I think iodepth was greater than 1 but I don't have
the exact fio job parameters.
Stefan