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Re: [Qemu-devel] qemu-nbd performance

From: Eric Blake
Subject: Re: [Qemu-devel] qemu-nbd performance
Date: Wed, 19 Sep 2018 10:29:53 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0

On 9/19/18 1:46 AM, lampahome wrote:

All images are on the RAID0(3 SSD).
Below is the performance:

image number    seq. read(MB/s)    seq. write(MB/s)

1                        1480                      60

16                      1453                      36

32                      1450                      36

64                      1430                      36

128                     1400                     36

It shows reading better than writing.
I confused about why, does qemu did something to delay the write?

Not intentionally. But you'd have to profile things to learn where the hotspots are, in order to figure out how to reduce the overhead.

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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