Re: 2.6.2 - System clock runs too fast

[john stultz <johnstul@us.ibm.com>]

On Wed, 2004-02-11 at 01:07, Markus Hofmann wrote:
> Thank you for answering.
> In the meantime I heard that apm could cause this problem. I tested this by 
> compiling acpi. The result was that the clock runs normal with acpi.
> But I want to use apm. So I removed the acpi and now the system clock is too 
> slow with only apm.
> 
> I think this is a very curious thing! :-(

Indeed, normally its ACPI that causes more problems. That's a new one.

I'd be curious how this drift changes using the attached patch.

thanks
-john

===== arch/i386/kernel/timers/timer_tsc.c 1.35 vs edited =====
--- 1.35/arch/i386/kernel/timers/timer_tsc.c	Wed Jan  7 00:31:11 2004
+++ edited/arch/i386/kernel/timers/timer_tsc.c	Tue Jan 20 13:22:54 2004
@@ -226,7 +226,7 @@
 	delta += delay_at_last_interrupt;
 	lost = delta/(1000000/HZ);
 	delay = delta%(1000000/HZ);
-	if (lost >= 2) {
+	if (0 && (lost >= 2)) {
 		jiffies_64 += lost-1;
 
 		/* sanity check to ensure we're not always losing ticks */