Messages in this thread |  | | Date | Wed, 18 Sep 2002 01:52:09 +0200 | From | Andi Kleen <> | Subject | Re: do_gettimeofday vs. rdtsc in the scheduler |
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On Tue, Sep 17, 2002 at 04:32:46PM -0700, David S. Miller wrote: > From: john stultz <johnstul@us.ibm.com> > Date: 17 Sep 2002 16:32:15 -0700 > > Additionally, where is this system tick thing? You make it sound like > its a register in the cpu, and while the Ultra-III may have one, I'm > unaware of a system/bus tick register on intel chips. Is it in some > semi-documented MSR? > > It's in a register on Ultra-III. The whole point of this > conversation, if you read my initial postings, is that > "this should have been specified in the x86 architecture" > > I know full well it isn't currently :-)
Sorry, it's wrong. The x86 architecture has several such registers (apic timers, 8253 timer, HPET [Microsoft requires this for new hardware that will be w*s certified]) They just all suck on various systems or in general. HPET is ok, but still not widespread enough.
-Andi
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