Re: [Qemu-devel] qemu-nbd performance

[Eric Blake]

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