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Date: Fri, 21 Feb 2003 15:42:35 -0500 (EST)
From: Ion Badulescu <ionut@badula.org>
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To: Mikael Pettersson <mikpe@user.it.uu.se>
cc: Jeff Garzik <jgarzik@pobox.com>, <linux-kernel@vger.kernel.org>
Subject: Re: UP local APIC is deadly on SMP Athlon
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On Fri, 21 Feb 2003, Ion Badulescu wrote:

> Anyway, I'll keep on digging.

And this is what I found: eliminating two lines from 
APIC_init_uniprocessor() makes the problem go away.

diff -urNX diff_kernel_excludes linux-2.4.10-pre12/arch/i386/kernel/apic.c linux-2.4.10-pre11++/arch/i386/kernel/apic.c
--- linux-2.4.10-pre12/arch/i386/kernel/apic.c	Wed Feb 19 23:53:15 2003
+++ linux-2.4.10-pre11++/arch/i386/kernel/apic.c	Fri Feb 21 15:37:06 2003
@@ -1087,9 +1087,6 @@
 
 	connect_bsp_APIC();
 
-	phys_cpu_present_map = 1;
-	apic_write_around(APIC_ID, boot_cpu_id);
-
 	apic_pm_init2();
 
 	setup_local_APIC();

[patch against 2.4.10-pre12, but 2.4.21-pre4 is reasonably similar]

Ion

-- 
  It is better to keep your mouth shut and be thought a fool,
            than to open it and remove all doubt.

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