Re: [Xen-devel] Re: [Xen-users] About profiling xen

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

On 10/01/09 14:26, Marco Tizzoni wrote:
>> OK, good, that takes timers out of the equation.
>>
>> I guess the problem is the rate at which Xen will context switch between
>> two domains.  Hm.
>>
>> Does anything change if you pin your domains to different cpus?
>>     
> mmmh, no. I think without a finer timer the problem could not be solved.
>   

Why's that?  You said that the timers "work as expected", which I read
to mean that they will generate sub-millisecond events.  Did I
misunderstand you?

> For my test application, no problem, I'll use a while() loop with
> counters and sched_yeld(),
> but, for real application, it could be a serious issue to deal with.
>   

I don't see why that would be necessary if timers are working properly.

    J

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel