Avi Kivity wrote:
On 03/23/2010 04:50 AM, Badari Pulavarty wrote:
Anthony Liguori wrote:
On 03/22/2010 08:45 PM, Badari Pulavarty wrote:
Anthony Liguori wrote:
On 03/22/2010 08:00 PM, Badari Pulavarty wrote:
Forgot to CC: KVM list earlier
These virtio results are still with a 2.6.18 kernel with no aio,
right?
Results are on 2.6.33-rc8-net-next kernel. But not using AIO.
Can you try with aio and cache=none?
aio-native,cache=none
# time dd if=/dev/vda of=/dev/null bs=128k iflag=direct
640000+0 records in
640000+0 records out
83886080000 bytes (84 GB) copied, 470.588 seconds, 170 MB/s
You're effectively killing readahead with this.
Yes. cache=none, aio=native will force it hit the disk all the time. We
loose all the benefits of
readahead.
Please use fio with a sequential pattern, queue depth > 1.
Will do.
Thanks,
Badari
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