Am 01.07.2012 23:13, schrieb Mark Nelson:
On 7/1/12 4:01 PM, Stefan Priebe wrote:
Hello list,
Hello sage,
i've made some further tests.
Sequential 4k writes over 200GB: 300% CPU usage of kvm process 34712 iops
Random 4k writes over 200GB: 170% CPU usage of kvm process 5500 iops
When i make random 4k writes over 100MB: 450% CPU usage of kvm process
and !! 25059 iops !!
When you say 100MB vs 200GB, do you mean the total amount of data that
is written for the test?
Yes/No, it is the max amount of data written but for random I/O it is
also the range like random block device position between 0 and X where
to write the 4K block.
> Also, are these starting out on a fresh
filesystem?
Yes, 5 Min old in this case ;-)
Stefan
--
To unsubscribe from this list: send the line "unsubscribe ceph-devel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
