It's already in qemu 2.9
http://git.qemu.org/?p=qemu.git;a=commit;h=2d9187bc65727d9dd63e2c410b5500add3db0b0d
"
This patches introduces 2 new cmdline parameters. The -m parameter to specify
the number of coroutines running in parallel (defaults to 8). And the -W parameter to
allow qemu-img to write to the target out of order rather than sequential. This improves
performance as the writes do not have to wait for each other to complete.
"
And performance was dramatically increase!
Runed it with Luminous and qemu 2.9.0 (this is host with qemu-img,
network bandwith with ceph cluster):
http://storage6.static.itmages.ru/i/17/1223/h_1514004003_2271300_d3ee031fda.png
From 11:05 to 11:28: 35% of 100Gb. Started googling about news in
qemu, founded this message. Append -m 16 -W. Network iface utilisation
was raises from ~150Mbit/s to ~2500Mbit/s (this is convert from one rbd
pool to another).
k
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