Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262459AbVAEPIL (ORCPT ); Wed, 5 Jan 2005 10:08:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262461AbVAEPIL (ORCPT ); Wed, 5 Jan 2005 10:08:11 -0500 Received: from clock-tower.bc.nu ([81.2.110.250]:58553 "EHLO localhost.localdomain") by vger.kernel.org with ESMTP id S262459AbVAEPIG (ORCPT ); Wed, 5 Jan 2005 10:08:06 -0500 Subject: Re: Very high load on P4 machines with 2.4.28 From: Alan Cox To: indrek.kruusa@tuleriit.ee Cc: Linux Kernel Mailing List In-Reply-To: <41DBCAE5.9010408@tuleriit.ee> References: <41DBCAE5.9010408@tuleriit.ee> Content-Type: text/plain Content-Transfer-Encoding: 7bit Message-Id: <1104929106.24896.171.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 (1.4.6-2) Date: Wed, 05 Jan 2005 14:03:46 +0000 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 613 Lines: 18 > Maybe I am victim of marketing (or poor memory) but wasn't it so that > x86 instruction HLT was possible to use for single logical processor? You can easily park one of the threads ("rep nop" is used as a hint to give the CPU back to the other thread so 1: hlt rep nop jr 1b ought to do it, but in HT mode other stuff like the cache behaviour is often changed - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/