Clocksource tsc unstable
 

My server keeps hanging and when I see the last event that occurred before the system lags in /var/log/messages, it is the following:

I asked someone about this and he suspected that my CMOS battery was dying. I replaced it. The problem remains.

This only started after I upgraded to Fedora 7. I didn't have this problem prior to that.

Has anyone else experienced the issue and/or knows of a fix or what this problem truly is?

TIA.

TSC=Time Stamp Counter. Processors have dynamically changed clock speed (ofc to save power). The TSC is supposed to tick at the CPU rate (unless it's a constant_tsc, see /proc/cpuinfo flags, so on frequency change, this ought to happen. The kernel will automatically switch to something else. There's acpi_pm <-(this is what yours has switched to) and, IIRC, pit. This message seems to appear with the newer kernel upgrades.

Thanks for the information. How do I remove it? Can I add constant_tsc to the flags on /proc/cpuinfo?

Bump - just don't want to do the wrong thing and have kernel panic.

Okay, I can't edit /proc/cpuinfo anyway. What can I do to avoid this problem? My server is dying nearly every 24-36 hours.

Roll back to your previous kernel or see if there is a patch you can apply to your current kernel.

I think all the previous kernels work for FC6. This problem only existed when I upgraded to FC7. I'm not familiar with how to go about this. :(

bump for anyone specifically familiar with this for FC7. I'm about to reboot my machine again because of this problem. :(

You could try disabling the acpi in the bios, other than that there seems to be various fixes around for the tsc problem. I don't know if any of them will help you. To see a few put this in google: Fix TSC timer selection

I'm going to take the route to disable ACPI in the BIOS. We'll see what happens. Thanks.

Just wanted to be fair to update this thread and say that it appears disabling the ACPI in the BIOS in fact did the trick. Thanks :)

thanks
 

that also helped me.

Thanks everybody.