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Subject: Re: [PATCH] boot time parameter to turn of TSC usage
From: Stephen Hemminger <shemminger@osdl.org>
To: Andrew Morton <akpm@digeo.com>
Cc: Linus Torvalds <torvalds@transmeta.com>, johnstul@us.ibm.com,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Jerry Cooperstein <coop@axian.com>
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On Tue, 2003-03-18 at 16:39, Andrew Morton wrote:
> Stephen Hemminger <shemminger@osdl.org> wrote:
> >
> > For machines that don't want to cooperate and have bad TSC counter and/or
> > change CPU frequency without change support.
> > 
> > This fixes the problem on Jerry Cooperstein's PIII laptop.
> > Could be useful for other people and tech support situations.
> 
> Is there no way in which this can be auto-detected?

Will leave that for someone with more direct knowledge access to
the chipset info.

> 
> > +__setup("notsclock", tsc_noclock_setup);
> 
> People have recently worked to make Documentation/kernel-parameters.txt
> relatively up-to-date.  Please try to remember to keep it in sync...
> 

--- kernel-parameters.txt.orig	2003-03-18 08:36:39.000000000 -0800
+++ kernel-parameters.txt.new	2003-03-18 17:01:32.000000000 -0800
@@ -627,7 +627,12 @@
 
 	nosync		[HW,M68K] Disables sync negotiation for all devices.
 
-	notsc		[BUGS=IA-32] Disable Time Stamp Counter
+	notsc		[BUGS=IA-32] Disable Time Stamp Counter.
+			Turns off TSC in processor. Kernel must
+			be compiled without TSC support.
+	
+	notsclock	[BUGS=IA-32] Tells kernel not to use 
+			Time Stamp Counter for gettimeofday. 
 
 	nousb		[USB] Disable the USB subsystem
 



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