strange CPU speedups with SMP on Athlon 64 X2

Hi, I'm having a strange problem when I benchmark some of my physics simulation code on my new Athlon 64 X2 4800 machine. It occurs on all current kernels that I have tested including 2.6.12.5 and 2.6.13. If I run my benchmark single threaded, so that one of the two CPU cores is just idling

Re: lost ticks and Hangcheck

Please make sure this issue is reproducible without any binary only drivers. I uninstalled the NVIDIA drivers and tried again with the nv x.org driver. Same problem. I also tried remaining in text mode (with no NVIDIA drivers loaded). Same problem. In both cases it occurs when I start serio

Re: lost ticks and Hangcheck

I use the no_timer_check kernel parm and that keeps the clock from running at double speed. I still see some other annoying boot-time As I mentioned, no_timer_check doesn't fix it for me. In fact it makes the problem significantly worse. I tried it again just to be sure. Also I tried noapic

lost ticks and Hangcheck

Hi, I'm running kernel 2.6.12.5 with x86_64 target on an AMD X2 4800+ and Gigabyte GA-K8NXP-SLI motherboard (bios version F8). I'm having a problem with lost clock ticks. The dmesg says warning: many lost ticks. Your time source seems to be instable or some driver is hogging interupts Also