Re: [PATCH 07/10] sched: Migrate sched to use new tick dependency mask model

[Peter Zijlstra]

On Mon, Aug 10, 2015 at 04:16:58PM +0200, Frederic Weisbecker wrote:

> I considered many times relying on hrtick btw but everyone seem to say it has a lot
> of overhead, especially due to clock reprogramming on schedule() calls.

Yeah, I have some vague ideas of how to take out much of that overhead
(tglx will launch frozen sharks at me I suspect), but we cannot get
around the overhead of actually having to program the hardware and that
is still a significant amount on many machines.

Supposedly machines with TSC deadline are better, but I've not tried
to benchmark that.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/