On 2011-04-13 23:41, Dimitry Andric wrote:
...
But I don't really see why, yet. :) With r220532, it worked fine.
Ah, I failed to notice the commit that came before, r220583.
Apparently, it can happen (at least in a VM environment) that the
DELAY(1000) in this fragment from cpu_est_clockrate():
wrmsr(MSR_MPERF, 0);
wrmsr(MSR_APERF, 0);
tsc1 = rdtsc();
DELAY(1000);
mcnt = rdmsr(MSR_MPERF);
acnt = rdmsr(MSR_APERF);
tsc2 = rdtsc();
intr_restore(reg);
perf = 1000 * acnt / mcnt;
will still read 0 from MSR_MPERF, leading to a division by zero. Maybe
just fallback to the second method in the 'else' branch then?
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