Re: Severe IRQ problems on Foster (P4 Xeon) system

From: Martin Wilck (Martin.Wilck@fujitsu-siemens.com)
Date: Thu Mar 21 2002 - 13:53:58 EST


Dear Maciej,

> In short some code like:
>
> timer_ack = !(cpu_has_tsc &&
> APIC_INTEGRATED(GET_APIC_VERSION(apic_read(APIC_LVR))));
>
> should suffice as the condition to disable the code in
> do_timer_interrupt() for systems using the through-8259A mode. There is
> no need to keep it enabled unconditionally and I/O cycles are quite
> expensive. The following patch implements it. Please test it. It should
> cure your problems as a side effect, but that does not mean the BIOS isn't
> to be fixed.

please consider submitting this patch to Linus and Marcelo.
Perhaps it needs testing by some more people,
but I think it's the right thing to do.

Martin

-- 
Martin Wilck                Phone: +49 5251 8 15113
Fujitsu Siemens Computers   Fax:   +49 5251 8 20409
Heinz-Nixdorf-Ring 1	    mailto:Martin.Wilck@Fujitsu-Siemens.com
D-33106 Paderborn           http://www.fujitsu-siemens.com/primergy

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