On 06/14/2018 04:16 PM, Kevin Wolf wrote: > Am 08.06.2018 um 21:20 hat Vladimir Sementsov-Ogievskiy geschrieben: >> Do data compression in separate threads. This significantly improve >> performance for qemu-img convert with -W (allow async writes) and -c >> (compressed) options. >> >> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com> > Looks correct to me, but why do we introduce a separate > MAX_COMPRESS_THREADS? Can't we simply leave the maximum number of > threads to the thread poll? > > I see that you chose a much smaller number here (4 vs. 64), but is there > actually a good reason for this? > > Kevin yes. In the other case the guest will suffer much more from this increased activity and load on the host.
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