Broken lapic

[Kelly Price]

On 7/30/07, hirakendu das <hirakendu at yahoo.com> wrote:
> 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.
>

It's highly dependent on the motherboard used.  It's one reason why I
avoid BIOSTAR motherboards on the desktop -- they have a seriously
broken APIC/LAPIC setup that requires disabling the ACPI setup just to
run any modern Linux kernel.

Let us know what make/model of that laptop that has the broken LAPIC setup.

-- 
Kelly "STrRedWolf" Price
http://strredwolf.furrynet.com