Messages in this thread |  | | | Subject | Re: [PATCH 1/6] new timeofday core subsystem for -mm (v.B3) | | From | Lee Revell <> | | Date | Mon, 20 Jun 2005 19:44:56 -0400 |
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On Mon, 2005-06-20 at 14:53 -0700, john stultz wrote: > Yea, honestly I doubt gettimefoday performance will ever be as good as > rdtsc. I mean, that's a single instruction vs syscall overhead + > hardware clock reading + frequency conversion + ntp adjustment. Its > just not a fair comparison.
Of course not, the patch would have to be magic for that to happen.
But some user space apps are now *required* to use rdtsc for timing due to the massive performance difference. If we only took a 5x or 10x performance hit vs rdtsc, rather than the current 50x, it might be enough that user space apps won't have to do this.
Lee
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