On Mon, Nov 24, 2014 at 5:09 PM, Vasiliy Tolstov <v.tolstov@xxxxxxxxx> wrote:
> 2014-11-24 16:57 GMT+03:00 Andrey Korolyov <andrey@xxxxxxx>:
>> Hello Vasiliy,
>>
>> can you please check actual values via qemu-monitor-command domid '{
>> "execute": "query-block"}', just to be sure to pin the potential
>> problem to the emulator itself?
>
> virsh qemu-monitor-command 11151 '{ "execute": "query-block"}' | jq '.'
> {
> "return": [
> {
> "io-status": "ok",
> "device": "drive-scsi0-0-0-0",
> "locked": false,
> "removable": false,
> "inserted": {
> "iops_rd": 0,
> "image": {
> "virtual-size": 21474836480,
> "filename": "/dev/vg3/11151",
> "format": "raw",
> "actual-size": 0,
> "dirty-flag": false
> },
> "iops_wr": 0,
> "ro": false,
> "backing_file_depth": 0,
> "drv": "raw",
> "iops": 5000,
> "bps_wr": 0,
> "encrypted": false,
> "bps": 0,
> "bps_rd": 0,
> "iops_max": 500,
> "file": "/dev/vg3/11151",
> "encryption_key_missing": false
> },
> "type": "unknown"
> }
> ],
> "id": "libvirt-22"
> }
>
> i'm used this site
> http://www.ssdfreaks.com/content/599/how-to-convert-mbps-to-iops-or-calculate-iops-from-mbs
> root@11151:~# dd if=/dev/sda bs=4K of=/dev/null
> 5242880+0 records in
> 5242880+0 records out
> 21474836480 bytes (21 GB) copied, 45.2557 s, 475 MB/s
>
> so in case of 5000 iops i need to get only 19-20 MB/s
>
>
> --
> Vasiliy Tolstov,
> e-mail: v.tolstov@xxxxxxxxx
> jabber: vase@xxxxxxxxx
I am not sure for friendliness of possible dd interpretations for new
leaky bucket mechanism, as its results can be a little confusing even
for fio (all operations which are above the limit for long-running
test will have 250ms latency, putting down score numbers in most
popular tests like UnixBench), also w/o sync options these results are
almost meaningless. May be fio with direct=1|fsync=1 (for fs) will
give a more appropriate numbers in your case.
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