Time Fast on SMP

Time Fast on SMP

[Lee Trager]

I recently upgraded from an AMD 3500+ to an AMD X2 4400(dual core thus 
SMP). After a couple of hours of use I noticed that the system clock was 
going fast, I did some googling and found some boot options to add to my 
kernel in order to make it go away(currently notsc no_timer_check=0). 
While both of those help it seems that my system time does get faster 
and faster when I do CPU intensive stuff such as compiling and gaming. 
This problem appears on both 2.6.14 and 2.6.15. Ive looked all over for 
patches and other fixes but ive found nothing that will fix this, Im not 
sure if this is a kernel bug or not so I posted here to see if anyone 
could help me before I report it. Could someone please help me?

Thanks,

Lee Trager

Re: Time Fast on SMP

[Randy.Dunlap]

On Thu, 05 Jan 2006 01:33:02 -0500 Lee Trager wrote:

> I recently upgraded from an AMD 3500+ to an AMD X2 4400(dual core thus 
> SMP). After a couple of hours of use I noticed that the system clock was 
> going fast, I did some googling and found some boot options to add to my 
> kernel in order to make it go away(currently notsc no_timer_check=0). 
> While both of those help it seems that my system time does get faster 
> and faster when I do CPU intensive stuff such as compiling and gaming. 
> This problem appears on both 2.6.14 and 2.6.15. Ive looked all over for 
> patches and other fixes but ive found nothing that will fix this, Im not 
> sure if this is a kernel bug or not so I posted here to see if anyone 
> could help me before I report it. Could someone please help me?

I don't know if it is relevant for your system, but this was
just discussed on lkml today.  There is a patch that may or
may not help you:
  http://lkml.org/lkml/2005/11/24/188

and another kernel boot option:
  disable_timer_pin_1
that someone suggested could help.

---
~Randy

Re: Time Fast on SMP

[Lee Trager]

I tired the patch with and with out disable_timer_pin_1 as boot options 
and I still get a fast clock :\

Randy.Dunlap wrote:

>On Thu, 05 Jan 2006 01:33:02 -0500 Lee Trager wrote:
>
>  
>
>>I recently upgraded from an AMD 3500+ to an AMD X2 4400(dual core thus 
>>SMP). After a couple of hours of use I noticed that the system clock was 
>>going fast, I did some googling and found some boot options to add to my 
>>kernel in order to make it go away(currently notsc no_timer_check=0). 
>>While both of those help it seems that my system time does get faster 
>>and faster when I do CPU intensive stuff such as compiling and gaming. 
>>This problem appears on both 2.6.14 and 2.6.15. Ive looked all over for 
>>patches and other fixes but ive found nothing that will fix this, Im not 
>>sure if this is a kernel bug or not so I posted here to see if anyone 
>>could help me before I report it. Could someone please help me?
>>    
>>
>
>I don't know if it is relevant for your system, but this was
>just discussed on lkml today.  There is a patch that may or
>may not help you:
>  http://lkml.org/lkml/2005/11/24/188
>
>and another kernel boot option:
>  disable_timer_pin_1
>that someone suggested could help.
>
>---
>~Randy
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