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


From: Alberto Garcia
Subject: Re: [Qemu-devel] [PATCH 0/7] qcow2: Reduce the number of I/O ops when doing COW
Date: Fri, 26 May 2017 15:08:43 +0200
User-agent: Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu)

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



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