Messages in this thread |  | | Date | Tue, 6 Feb 2007 13:37:16 +0100 | From | Ingo Molnar <> | Subject | Re: One-shot high-resolution POSIX timer periodically late |
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* John <shill@free.fr> wrote:
> > 2.6.18-rt7 is pretty old, do you see the problem in 2.6.20-rc6-rt5 > > too? > > Ingo, Thomas, > > I cannot reproduce in 2.6.20-rc6-rt6, but it is not strictly an > apples-to-apples comparison because I get a tsc clocksource in > 2.6.20-rc6-rt6, and an acpi_pm clocksource in 2.6.18.6-rt7.
that suggests that the TSC was not deemed reliable by the newer kernel - which almost always means it's not realiable. I think the problems you were seeing are consistent with TSC being non-monotonic - so the fix is to not use the TSC - and the newer kernel does this automatically.
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