Messages in this thread | | | Date | Sat, 4 Oct 2014 11:22:05 +0200 | From | Marc Burkhardt <> | Subject | Re: Slowdown due to threads bouncing between HT cores |
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* Steinar H. Gunderson <sgunderson@bigfoot.com> [2014-10-03 23:14:17 +0200]:
> On Fri, Oct 03, 2014 at 11:11:52PM +0200, Marc Burkhardt wrote: > > As I understand your mail, you problem is quite similar, isn't it? > > I guess it depends on how often your process migrates. If it happens, like, > every second, it's not a big problem (and probably is expected). > If it happens all the time, it might be; it depends a bit on a number of > factors.
Hi Steinar,
you say the behavior is probably expected, but I still don't get the point why this could be normal or even wanted. There's a cost for migrating the process to another CPU. In case my machine has 4 cores, 3 of them 'idle' and that 1 running process that keeps being migrated ... where's the benefit of migrating it?
Do you have any source/docs where I could read about this?
Thanks, Marc
> > /* Steinar */ > -- > Homepage: http://www.sesse.net/ > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >
-- Marc Burkhardt
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