Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261950AbTKDUU5 (ORCPT ); Tue, 4 Nov 2003 15:20:57 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262131AbTKDUU5 (ORCPT ); Tue, 4 Nov 2003 15:20:57 -0500 Received: from 209-166-240-202.cust.walrus.com ([209.166.240.202]:24293 "EHLO ti3.telemetry-investments.com") by vger.kernel.org with ESMTP id S261950AbTKDUUz (ORCPT ); Tue, 4 Nov 2003 15:20:55 -0500 Date: Tue, 4 Nov 2003 15:20:37 -0500 From: "Bill Rugolsky Jr." To: Linus Torvalds Cc: Paul Venezia , linux-kernel@vger.kernel.org Subject: Re: ext3 performance inconsistencies, 2.4/2.6 Message-ID: <20031104202037.GB30612@ti19.telemetry-investments.com> Reply-To: "Bill Rugolsky Jr." Mail-Followup-To: "Bill Rugolsky Jr." , Linus Torvalds , Paul Venezia , linux-kernel@vger.kernel.org References: <1067973024.23788.24.camel@d8000> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1159 Lines: 28 On Tue, Nov 04, 2003 at 11:36:55AM -0800, Linus Torvalds wrote: > > I've been running bonnie++ filesystems testing on an IBM x335 server > > recently. This box uses the MPT RAID controller, but I've disabled the > > RAID and am addressing the disks individually. I'm getting wildly > > different results between 2.4.20-20-9 (RedHat mod), 2.4.22 (stock), and > > 2.6.0-test9. > > Interesting. The 2.4.22 sequential "per char" results are totally out of > line with anything else. > > The thing is, the overhead for the per-char stuff really should be almost > all in user space unless I'm mistaken. It's just using getch/putch, no? Unless bonnie++ is using the _unlocked() variants, it might be an issue of the mutex overhead from NPTL v. LinuxThreads. Red Hat 9 has its share of NPTL bugs. It is probably worth rerunning the tests with LD_ASSUME_KERNEL=2.4.1 on the Red Hat kernel. Regards, Bill Rugolsky - 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/