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From: Marc-Christian Petersen <m.c.p@wolk-project.de>
Organization: Working Overloaded Linux Kernel
To: Ion Badulescu <ionut@badula.org>, Mikael Pettersson <mikpe@user.it.uu.se>
Subject: Re: UP local APIC is deadly on SMP Athlon
Date: Fri, 21 Feb 2003 22:41:23 +0100
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Cc: Jeff Garzik <jgarzik@pobox.com>, <linux-kernel@vger.kernel.org>
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On Friday 21 February 2003 21:42, Ion Badulescu wrote:

Hi Ion,

> 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]
Don't do this. I am pretty sure it will break all Intels. I still cannot 
understand why this fixes your AMD Athlon problem.

ciao, Marc
-
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