> On Fri, 21 Mar 2008, Gabriel C wrote:
>>>>> Does that make any sense ?
>>>> Not really. Can you please revert the reverted revert again and run
>>>>
>>>>
http://people.redhat.com/mingo/time-warp-test/time-warp-test.c
>>>>
>>>> on your machine with all CPUs and HT enabled ?
>>> Sure , doing so now.
>>>
>> Here the result on 2.6.25-rc6-00243-g028011e ( it was running 30++
>> minutes the time I was away for food =) )
>> ...
>>
>> 4 CPUs, running 4 parallel test-tasks.
>> checking for time-warps via:
>> - read time stamp counter (RDTSC) instruction (cycle resolution)
>> - gettimeofday (TOD) syscall (usec resolution)
>> - clock_gettime(CLOCK_MONOTONIC) syscall (nsec resolution)
>>
>> | 1.46 us, TSC-warps:0 | 16.01 us, TOD-warps:0 | 16.10 us, CLOCK-warps:0
>
> Amazing. I never found a multi socket box where the TSC's were in sync.
>
> So the rotating watchdog triggers for a yet to figure out reason.
>
> Oh, now that the pm timer seems to work again, can you try the following:
>
> apply the reverted patch again and let the box boot. At some point the
> TSC is marked unstable and is replaced by acpi_pm clocksource.
>
> What result does timewarp.c show in that situation ?
