Re: [PATCH] i386: fix TSC clock source calibration error

[Charles R Harris]

On Tue, 2007-10-16 at 10:50 -0400, Dave Johnson wrote:
>
>  range of tsc_khz  # of boots  % of boots
> -----------------  ----------  ----------
>         < 1999750           0      0.000%
> 1999750 - 1999800          21      3.048%
> 1999800 - 1999850         166     24.128%
> 1999850 - 1999900         241     35.029%
> 1999900 - 1999950         211     30.669%
> 1999950 - 2000000          42      6.105%
> 2000000 - 2000000           0      0.000%
> 2000050 - 2000100           0      0.000%
>                    [...]
> 2000100 - 2015000           1      0.145%  << BAD
> 2015000 - 2030000           6      0.872%  << BAD
> 2030000 - 2045000           1      0.145%  << BAD
> 2045000 <                   0      0.000%
>
> The worst boot was 2032.577 Mhz, over 1.5% off!

This may be related to bug
https://bugzilla.redhat.com/show_bug.cgi?id=270321 at Redhat bugzilla.
It has been easily reproducible on my machine.

Chuck
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