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From Vladimir Melnik <v.mel...@uplink.ua>
Subject Re: Storage Performance
Date Mon, 06 Jun 2016 14:26:04 GMT
Dear colleagues,

I've found why guest's storage performance was much less than host's performance (the mistake
was too stupid to tell about it, really).

But I'd like to ask one more question if you don't mind. :) I played with various KVM options
(cache, io and so on...) and now I can say that I got most IOpS with cache=writeback. Tests
are being performed with the fio utility, here is the jobfile contents:
	[readtest]
	blocksize=4k
	filename=/dev/vdb
	rw=randread
	direct=1
	buffered=0
	ioengine=libaio
	iodepth=32
	size=20%

	[writetest]
	blocksize=4k
	filename=/dev/vdb
	rw=randwrite
	direct=1
	buffered=0
	ioengine=libaio
	iodepth=32
	size=20%

Is there any way to make ACS run create KVM domains with cache=writeback instead of cache=none
without patching the source code?

Thank you!

-- 
V.Melnik

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