[LITMUS^RT] Question about TSC

[Christopher Kenna]

Hi,

I was browsing LWN and the mailing list when I saw the linked email
thread. It pertains to the TSC, calibrating it, and how a
mis-calibration can affect NTP. The whole calibration process is
pretty involved (the code is well commented, but certainly more than I
care to try and figure out at the moment). Regardless, I thought that
it was interesting and that Mac and others may want to give it a read:
http://thread.gmane.org/gmane.linux.kernel/1239882/focus=1240513

 -- Chris

2012/1/19 Björn Brandenburg <bbb at mpi-sws.org>:
>
> On Jan 18, 2012, at 8:45 PM, Mac Mollison wrote:
>
>> In case it's useful to somebody at some point, I'll mention yet another
>> way to "validate" experimental results using the TSC, that I thought
>> of. The Linux kernel indicates to userspace whether it trusts the TSC
>> [1]; presumably, if it trusts the TSC both before and *after* the
>> experiments, the TSC has not gone haywire in between.
>
> Good idea; an automatic check for this would be a nice addition to 'ftcat' (in the feather-trace-tools.git repository).
>
> - Björn
>
>
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