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

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Date:	Thu, 18 Oct 2007 13:43:34 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	Dave Johnson <djohnson+linux-kernel@...starentnetworks.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i386: fix TSC clock source calibration error

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!

Can you tell us what type of machine this was? I've seen complaints
where the SMI's can cause some other funny stuff with calibration , be
no one can every reproduce anything..

Daniel

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