Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262972AbUDECK3 (ORCPT ); Sun, 4 Apr 2004 22:10:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263012AbUDECK3 (ORCPT ); Sun, 4 Apr 2004 22:10:29 -0400 Received: from mail.tmr.com ([216.238.38.203]:56844 "EHLO gatekeeper.tmr.com") by vger.kernel.org with ESMTP id S262972AbUDECK1 (ORCPT ); Sun, 4 Apr 2004 22:10:27 -0400 To: linux-kernel@vger.kernel.org Path: not-for-mail From: Bill Davidsen Newsgroups: mail.linux-kernel Subject: Re: 2.6.4 : 100% CPU use on EIDE disk operarion, VIA chipset Date: Sun, 04 Apr 2004 22:12:44 -0400 Organization: TMR Associates, Inc Message-ID: References: <406FC226.5090802@A8bb8.a.pppool.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Trace: gatekeeper.tmr.com 1081130898 1875 192.168.12.10 (5 Apr 2004 02:08:18 GMT) X-Complaints-To: abuse@tmr.com User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6b) Gecko/20031208 X-Accept-Language: en-us, en In-Reply-To: <406FC226.5090802@A8bb8.a.pppool.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1357 Lines: 34 Andreas Hartmann wrote: > Bill Davidsen wrote: > >> Andreas Hartmann wrote: >> >>> This is what top says during cp of 512MB-file: >>> Cpu(s): 2.0% us, 8.3% sy, 0.0% ni, 0.0% id, 89.0% wa, 0.7% hi, >>> 0.0% si >>> >>> New is "wa", what probably means "wait". This value is very high as >>> long as the HD is writing or reading datas: >>> >>> cp dummy /dev/null >>> produces this top-line: >>> Cpu(s): 3.0% us, 5.3% sy, 0.0% ni, 0.0% id, 91.0% wa, 0.7% hi, >>> 0.0% si >> >> >> Yes "wa" is not intuitive, some other operating systems use "wio" for >> "wait i/o" time. As noted in the other thread, you can try the >> deadline elevator or increased readahead for your load. > > > If the processor and the kernel could do other things during wa, like > compiling e.g., it would be no problem. But it seems to be, that this is > not possible. Or did I oversee something? Yes, wio is similar to idle, processor is available for work even if disk access is running slowly. -- bill davidsen CTO TMR Associates, Inc Doing interesting things with small computers since 1979 - 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/