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From: John Hay <jhay@mikom.csir.co.za>
Message-Id: <199802230912.LAA13211@zibbi.mikom.csir.co.za>
Subject: Re: cvs commit: src/sys/i386/isa clock.c
In-Reply-To: <199802230011.QAA02130@freefall.freebsd.org> from Bruce Evans at "Feb 22, 98 04:11:29 pm"
To: bde@FreeBSD.ORG (Bruce Evans)
Date: Mon, 23 Feb 1998 11:12:46 +0200 (SAT)
Cc: cvs-committers@FreeBSD.ORG
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> bde         1998/02/22 16:11:28 PST
> 
>   Modified files:
>     sys/i386/isa         clock.c 
>   Log:
>   Quick fix for the i8254 timecounter often gaining 10 msec.
>   

Thanks. This seems to have fixed my clock runaway problem on the SMP
machine.

That together with the two kernel options CLK_USE_TSC_CALIBRATION and
CLK_USE_I8254_CALIBRATION has resulted in a frequency error of less
than 1ppm, it seems.

BTW It is probably not necessary to have the CLK_USE_TSC_CALIBRATION
defined on SMP machines as they use the i8254.

John
-- 
John Hay -- John.Hay@mikom.csir.co.za

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