Re: [libvirt] [Qemu-devel] strange behavior when using iotune
On Mon, Nov 24, 2014 at 5:09 PM, Vasiliy Tolstov <v.tolstov(a)selfip.ru> wrote:
2014-11-24 16:57 GMT+03:00 Andrey Korolyov <andrey(a)xdel.ru>:
> 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-calcu...
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(a)selfip.ru
jabber: vase(a)selfip.ru
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.