Re: do_gettimeofday vs. rdtsc in the scheduler

David S. Miller (davem@redhat.com)
Tue, 17 Sep 2002 13:39:33 -0700 (PDT)

From: john stultz <johnstul@us.ibm.com>
Date: 17 Sep 2002 13:29:18 -0700

Some NUMA boxes do not have synced TSC, so on those systems your
code won't work.

It would have been really nice if x86 had specified a "system tick"
register that incremented based upon the system bus cycles and thus
were immune the processor rates.

I foresee lots of patches coming which basically are "how does this
x86 system provide a stable synchronized tick source".
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