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Re: [Xen-devel] CAP and performance problem

On 06/06/2013 03:03 PM, Dario Faggioli wrote:
On gio, 2013-06-06 at 14:52 +0200, Massimo Canonico wrote:
On 06/06/2013 12:44 PM, George Dunlap wrote:
You can test this by setting the xen hypervisor boot option


and run your test again (with and without cap).
Ah, genius Juergen!  That would make total sense.


Unfortunately, this did not change much. I set "cpufreq=none" in the
boot line and restart my experiment.
With no cap I got 298.029
with cap=50% I got 910.272
(average values of 3 experiments for each cap setting)

Mmm... 298.029 is a lot faster than what you reported before, though...
Are this the exact same experiments?

In fact, in the first e-mail of this thread you said that "with CAP =
100% I got my results in about 600 seconds". So, have you changed
something or the cpufred=none did at least have some effect?


Hi Dario,
I only changed the workload from "40 times matrix multiplications" to "20 times matrix multiplications" to get the results faster, since I do not think that this makes any difference in perfomance comparisin between cap/no cap.


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