sched_mc test scenario
daniel.lezcano at linaro.org
Thu Aug 4 08:57:10 UTC 2011
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On 08/03/2011 06:25 PM, Vincent Guittot wrote:
> Hi Daniel,
> On 3 August 2011 15:58, Daniel Lezcano <daniel.lezcano at linaro.org> wrote:
[ ... ]
>> it sounds good for me.
Ok, cool. Thanks.
> Concerning the functional tests, I need some hints :)
> On the architecture we have, that will be difficult to verify sched_mc
> works as expected.
> If I understood correctly, in order to test that, we should have a
> dual Cortex-A9 to check a program with two processes eating a lot of
> cpu cycles will be bounded in the same socket_id when
> The other processor staying idle or not running any of these
> processes, right ? AFAIK, there is no such hardware, no ?
>> you could integrate a non regression test which check that performance
>> results in both sched_mc_power_savings=0 and sched_mc_power_savings=2
>> . I have one which uses cyclictest and sysbench.
Can you elaborate a bit ? Do you mean, we should run the test and
compare the result to some hardcoded values (taking account the
hysteresis of course) ?
>> Then, you're right
>> that we must wait a bit before adding some functional tests which test
>> that sched_mc is working as expected (from a power saving point of
>> view) with sched_mc_power_savings=2
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