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Time Fast on SMP

DISCUSSION Lee Trager 2 participants 3 messages Jan 5, 2006 – Jan 6, 2006

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Lee Trager

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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

#1 lore raw
Quoted 10 lines · 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

author
#2 lore raw

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

Quoted 26 lines · Randy.Dunlap
Quoted 3 lines · 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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