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To: linux-kernel@vger.kernel.org
Subject: Re: IO-APIC in SMP dual Athlon XP1800
References: <Pine.LNX.4.44.0207292151420.20701-100000@linux-box.realnet.co.sz>
	<200209051453.54728.scorpionlab@ieg.com.br>
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From: Johan Kullstam <kullstj-ml@attbi.com>
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Date: 05 Sep 2002 20:31:08 -0400
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 Alan Cox <alan@lxorguk.ukuu.org.uk> writes:

> On Thu, 2002-09-05 at 18:53, Scorpion wrote:
> > Hi All,
> > I got my Dual Athlon XP1800 working now. 
> > Everything gonna well after changed MP 1.4 Support to disable in BIOS, and 
> > leaving MP table enabled.
> > Anyone knows if linux 2.4.19 has not yet a full implemantation of MP 1.4 or if 
> > it is just a BIOSes bug?
> 
> On the 1004 BIOS with the ASUS it seems to be a bios table error. Later
> BIOSes fixed it, then removed the option, then broke lots of other
> stuff. I went back to 1004 so I dont know how the newest fare

I am using 1006.  I have enabled MP 1.4 in order to get the IRQ
numbers 16 and beyond.  I am not sure how useful that is since several
PCI IRQs are shared and there are lots of free ones.  Anyhow, MP 1.1
works just fine too.  I am using the Athlon MP 1900+ CPUs.

Note to anyone who is considering this cpu/motherboard, this combo
uses *shedloads* of power.  400W is *not* enough (I've seen Alan post
to this effect before but it bears repeating).  Also, make sure you
have good case airflow -- all that power that is being consumed is
being turned into heat.  Aftermarket CPU heatsink and fan are a good
idea.  Unfortunately, it is a bit crowded for 80mm CPU fans though.

Things are stable now once I mitigated the heat death problem.

-- 
Johan KULLSTAM
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