Messages in this thread |  | | Date | Tue, 17 Sep 2002 13:54:51 -0700 (PDT) | Subject | Re: do_gettimeofday vs. rdtsc in the scheduler | From | "David S. Miller" <> |
| |
From: Andi Kleen <ak@suse.de> Date: 17 Sep 2002 23:00:38 +0200
Also reading HPET is somewhat more costly than reading TSCs because it goes to the southbridge, so there are cases where using TSC is probably better (e.g. I think for networking packet time stamping the TSC is just fine with all its limitations)
The cpu gets a bus clock input, so the system tick should be processor local as much as TSC is.
It's boggling that this is being messed up so much. I can't believe Sun got something incredibly right (Ultra-III has a system tick) :-) - 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/
|  |