linux-kernel - Re: [X86 ACPI SMP] system slow after cold start if processor module loaded

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Message-Id: <20080205151451.a47535c2.akpm@linux-foundation.org>
Date:	Tue, 5 Feb 2008 15:14:51 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Guennadi Liakhovetski <g.liakhovetski@....de>
Cc:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [X86 ACPI SMP] system slow after cold start if processor module
 loaded

On Sat, 2 Feb 2008 16:05:41 +0100 (CET)
Guennadi Liakhovetski <g.liakhovetski@....de> wrote:

> Hi
> 
> Don't know if this should be considered a bug-report, or just another ACPI 
> bug on my system. In any case, if the CONFIG_ACPI_PROCESSOR is enabled, on 
> first boot after a power off the system is slow. Not like if only 1 of 2 
> CPUs actually was running, much slower yet. Respectively, if the module is 
> built into the kernel, it is slow more or less from the beginning - I 
> guess, from the moment, when the module is initialized, if built as a 
> module, it is slow after the module gets loaded. Also funny, it is only 
> slow on the first boot, after a reboot into the same kernel it runs 
> normally. The system is a dual P-II@...MHz, Compaq AP400. It is known to 
> have various ACPI bugs, so, this is just another one of them. No idea 
> whether or not this shall and can be fixed. At least wanted to document it 
> in case someone has a similar problem.
> 

(added linux-acpi)

If nothing happens with this (likely) then please raise a report against
acpi at bugzilla.kernel.org, thanks.

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