From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <40659FE8.8030709@swtch.com>
From: Russ Cox <rsc@swtch.com>
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To: 9fans@cse.psu.edu
Subject: Re: [9fans] rio and acme scrolling
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Date: Sat, 27 Mar 2004 10:38:16 -0500
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>Alternatively, why not use the TSC when there is one?  I note that
>this is the default for the MP architecture, but only for CPU server
>kernels -- does anyone know why?
>
>Here's a one-line fix which also seems to work on my thinkpad:
>
>term% diff /sys/src/9/pc/devarch.c devarch.c
>692a693
>  
>
>>		archgeneric.fastclock = tscticks;
>>    
>>

The TSC is not reliable once the BIOS starts playing tricks
with CPU speeds.  Try unplugging your Thinkpad and see
if your TSC keeps running at the same speed.

Russ