Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262730AbUDDT6F (ORCPT ); Sun, 4 Apr 2004 15:58:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262732AbUDDT6F (ORCPT ); Sun, 4 Apr 2004 15:58:05 -0400 Received: from webmail.sub.ru ([213.247.139.22]:53254 "HELO techno.sub.ru") by vger.kernel.org with SMTP id S262730AbUDDT6B (ORCPT ); Sun, 4 Apr 2004 15:58:01 -0400 Subject: Re: 2.6.4 : 100% CPU use on EIDE disk operarion, VIA chipset From: Mikhail Ramendik To: Andreas Hartmann Cc: linux-kernel@vger.kernel.org In-Reply-To: <406FC621.1090507@A88da.a.pppool.de> References: <406FC621.1090507@A88da.a.pppool.de> Content-Type: text/plain Message-Id: <1081108674.1072.4.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.5 (1.4.5-6aspMR) Date: Sun, 04 Apr 2004 23:57:55 +0400 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1618 Lines: 53 Hello, Andreas Hartmann wrote: > > As recommended there, I have tried 2.6.5-rc3-mm4. > > > > No change. Still 100% CPU usage; the performance seems teh same. > > Yes. But it's curious: > Take a tar-file, e.g. tar the compiled 2.6 kernel directory. Than, untar > it again - the machine behaves total normaly. Not really. I tried a "simple" tar (no gzib/bzip2) - it was the same as with cp, a near-100% CPU "system" load, most of it iowait. If I use bzip2 with tar, then yes, the load is nearly 100% "user", actually it's bzip2. But this is because the disk i/o is done at a *far* slower rate; the bottleneck is the CPU. If we don't read (or write) the disk heavily, naturally the system/iowait load is low. I tried doing a "cp" in another xterm window, while the tar/bzip2 was running. And sure enough, up the CPU system/iowait usage goes - the "cp"'s disk i/o takes much of the CPU time away from the bz2 task! Looks exactly like a cause of performance problems. (All of this was done on 2.6.5-rc3-mm4). Yours, Mikhail Ramendik > And the 2.6-kernel is about > 23% faster than the 2.4-kernel. > > > > Yours, Mikhail Ramendik > > > > P.S. Sorry for making all comments into answers to your letter. I just > > don't want to break the thread. > > No problem - it's easier to read with comment directly in the text. > > > Regards, > Andreas Hartmann > > - 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/