Time going backwards 2005-12-04 - By coyote@(protected)
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On Sat, 3 Dec 2005, Ed Wilts wrote:
> Thanks, Arjan, I'll give that a try. What should the vendor be using
> for time keeping if not the tsc counter? I'm not a developer, but I'd
> like to tell him what he should have done instead.
>
> What are the drawbacks to adding notsc? I assume there would be some or
> it would be the default, wouldn't it?
Just a shot in the dark but since these machines are of course multi-cpu
it comes to mind.. Are the cpu stepping/revision identical (or not) on the
systems that exhibit these problems? I don't think this can be checked by
using /proc/cpuinfo and you might have to look it up on the entire cpu
module or on the chip itself..
I remember quite vividly a quad-cpu PPro system where a clock jumping
issue was solved when the 4th cpu was replaced with another (the latter
with the same rev as the others).
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