Re: [PATCH] 2.6, 2.4, Nforce2, Experimental idle halt workaroundinstead of apic ack delay.

[Derek Foreman]

On Thu, 12 Feb 2004, Daniel Drake wrote:

> Derek Foreman wrote:
> > Is there a measurable performance loss over not having the patch at all?
> > Some nforce2 systems work just fine.  Is there a way to distinguish
> > between systems that need it and those that don't?
>
> Do you have one of those systems to hand? My betting is on that when you
> enable APIC/IOAPIC you will see crashes very frequently. This isn't enabled in
> the default kernel config..

APIC, ACPI, IOAPIC, enabled or disabled..  lots of different kernels
soltek frn2 nforce2 based board, barton XP 2500+, 512mb ddr
Bios doesn't allow disabling of stop grant, but I've tried both states
with athcool.

It's really entering the stop grant state, because when completely idle it
makes a measurable heat difference.  (though when playing mp3s, almost all
of the cooling benefit is lost)

This machine hasn't crashed yet.

If there's something I can do to crash it so I don't feel special
anymore,  or if there's some way I can provide useful information, let me
know.

> PS, Ross: Again, great work, thanks. I am running the patches you posted in
> the thread starter (without the previous ones) on 2.6.3-rc2-mm1 without problem.

I hope my email wasn't interpreted as an attack on the patch.  I think
getting linux running on flakey hardware without any support at all from
the manufacturer is incredibly cool.
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