Broken lapic

[hirakendu das]

I had an issue with lapic on my desktop with athlon64 3800+ x2 and kernel 2.6.21. Without the boot option "nolapic_timer", it would arbitrarily hang (sometimes giving an acpi error on the cpu, and many a times giving a 'netdev watchdog transmit timed out' on my network card on heavy network usage.) From 2.6.22 kernel, I didn't require the nolapic_timer boot option and its stable as rock. However, even with nolapic_timer boot option, wakeups per second never exceed 200. I have a feeling that you have kept your timer frequency high, say 1000Hz or 864Hz. I suggest taking the 100Hz option (CONFIG_HZ_100=y) in the kernel.
 
Thanks,
 Hirakendu.

Vladimir Pouzanov <farcaller at gmail.com> wrote: Hi all,

I've got the following messages while booting:

...
ACPI: Local APIC address 0xfee00000
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
Processor #0 15:8 APIC version 16
ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled)
Processor #1 15:8 APIC version 16
...
Clockevents: could not switch to one-shot mode: lapic is not functional.
...

If I get it correctly, I have a broken lapic and that prevents NO_HZ stuff 
from working, thus I suffer from extra timer interrupts. Am I the 
only "happy" AMD Turion X2 64 owner, or somebody else has similar problems? I 
have ~650 wakeups per second and my battery works for 1-1.5 hours.

-- 
Sincerely,
Vladimir "Farcaller" Pouzanov
http://hackndev.com
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