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Re: [Qemu-devel] [PATCH 0/7] qcow2: Reduce the number of I/O ops when do


From: Anton Nefedov
Subject: Re: [Qemu-devel] [PATCH 0/7] qcow2: Reduce the number of I/O ops when doing COW
Date: Fri, 26 May 2017 16:32:49 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.1

On 05/26/2017 04:08 PM, Alberto Garcia wrote:
On Fri 26 May 2017 02:47:55 PM CEST, Anton Nefedov wrote:
Tried the another machine; about 10% improvement here
   [...]
address@hidden ~]# fio --name=randwrite --blocksize=4k
--filename=/dev/sdb --rw=randwrite --direct=1 --ioengine=libaio
--size=2g --io_size=32m

In my tests I sometimes detected slight performance decreases in that
HDD scenario but using 'write' instead of 'randwrite' (and --runtime=60
instead of --io_size).

Can you try and see how that works for you?

Berto


For me it keeps giving pretty much the same result before and after

 write: io=512736KB, bw=8545.4KB/s, iops=2136, runt= 60004msec

/Anton



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