Frequent Hangs w/ Fedora Core 2 on IBM ThinkCentre 8187-KU

[Alexander Dalloz]

Am Do, den 16.09.2004 schrieb Eric Mader um 22:16:

> I recently installed FC 2 on the above machine, which has a 3G Pentium 4 
> w/ hyperthreading. This machine seems to hang hard after a day or so of 

hyperthreading is the keyword

> running. It's usually just running the screen saver when it hangs. When 
> it hangs, it won't talk to the keyboard or the network - I have to use 
> the power button on the case to restart it.
> 
> The kernel seems to treat this machine as if it has two CPUs. Is that 
> the expected / correct thing for it to do? I'm running the SMP kernel. 
> I've seen the same problem w/ 2.6.5-1.358smp and 2.6.8-1.521smp.

See above, because it is a hyperthreading CPU it is treated as 2 CPUs.
It is correct but can too arise problems.

> Sep 14 05:23:58 Doramichan kernel: Losing too many ticks!
> Sep 14 05:23:58 Doramichan kernel: TSC cannot be used as a timesource.
> Sep 14 05:23:58 Doramichan kernel: Possible reasons for this are:
> Sep 14 05:23:58 Doramichan kernel:   You're running with Speedstep,
> Sep 14 05:23:58 Doramichan kernel:   You don't have DMA enabled for your 
> hard disk (see hdparm),
> Sep 14 05:23:58 Doramichan kernel:   Incorrect TSC synchronization on an 
> SMP system (see dmesg).

> Eric Mader

You can first try to find an option in the BIOS of your system to
disable the hyperthreading. If not available then try as kernel boot
parameter "acpi=noht". To do so press "a" at grub boot screen and enter
"3" and then append the above string to the kernel line. All without
quotes, I just used them to make the things clearer.

Alexander


-- 
Alexander Dalloz | Enger, Germany | GPG key 1024D/ED695653 1999-07-13
Fedora GNU/Linux Core 2 (Tettnang) kernel 2.6.8-1.521smp 
Serendipity 23:51:29 up 17 days, 21:08, load average: 0.09, 0.39, 0.46 
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