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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=32mIn 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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