From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Subject: Re: [X86 ACPI SMP] system slow after cold start if processor module loaded Date: Tue, 5 Feb 2008 15:14:51 -0800 Message-ID: <20080205151451.a47535c2.akpm@linux-foundation.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: Received: from smtp2.linux-foundation.org ([207.189.120.14]:36855 "EHLO smtp2.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755615AbYBEXPW (ORCPT ); Tue, 5 Feb 2008 18:15:22 -0500 In-Reply-To: Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Guennadi Liakhovetski Cc: linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org On Sat, 2 Feb 2008 16:05:41 +0100 (CET) Guennadi Liakhovetski 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@400MHz, 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.