Re: [Xen-users] Xen and I/O Intensive Loads

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

Doesn't really seem to make a difference which way I do it...I still see pretty intense disk I/O.

Here is some sample output from iostat in the domU:

Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await  svctm  %util

xvdb             12.20     0.00 1217.40   26.20  9197.60   530.80    15.65    29.66   23.47   0.80 100.00

Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await  svctm  %util

xvdb             18.40     0.00 1121.20   19.60  8737.60   691.50    16.53    32.97   29.13   0.88 100.00

Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await  svctm  %util

xvdb             27.80     0.00 1241.40   29.20  8158.40   377.90    13.44    42.59   33.73   0.79 100.00

Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await  svctm  %util

xvdb             31.60     0.00 1256.60   35.00  9426.40   424.00    15.25    42.06   32.44   0.77 100.00

Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await  svctm  %util

xvdb             57.68     0.00 1250.50   17.76  8588.42   352.99    14.10    51.36   40.60   0.79  99.80

the avgqu-sz is anywhere from 11 to 75, and the await is anywhere from 20 to 50.  %util is always around 100.

-Nick

>>> On 2009/08/26 at 12:00, Javier Guerra <javier@xxxxxxxxxxx> wrote:

On Wed, Aug 26, 2009 at 12:57 PM, Nick Couchman<Nick.Couchman@xxxxxxxxx> wrote:
> I've changed the dom0 elevator to noop and the domU to deadline.

shouldn't that be the other way around?

--
Javier

---

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