From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265129AbTL2XGm (ORCPT ); Mon, 29 Dec 2003 18:06:42 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265132AbTL2XGm (ORCPT ); Mon, 29 Dec 2003 18:06:42 -0500 Received: from [24.35.117.106] ([24.35.117.106]:65161 "EHLO localhost.localdomain") by vger.kernel.org with ESMTP id S265129AbTL2XFJ (ORCPT ); Mon, 29 Dec 2003 18:05:09 -0500 Date: Mon, 29 Dec 2003 18:05:03 -0500 (EST) From: Thomas Molina X-X-Sender: tmolina@localhost.localdomain To: Linus Torvalds cc: Kernel Mailing List Subject: Re: 2.6.0 performance problems In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 29 Dec 2003, Linus Torvalds wrote: > > > On Mon, 29 Dec 2003, Thomas Molina wrote: > > > > I just finished a couple of comparisons between 2.4 and 2.6 which seem to > > confirm my impressions. I understand that the comparison may not be > > apples to apples and my methods of testing may not be rigorous, but here > > it is. In contrast to some recent discussions on this list, this test is > > a "real world" test at which 2.6 comes off much worse than 2.4. > > Are you sure you have DMA enabled on your laptop disk? Your 2.6.x system > times are very high - much bigger than the user times. That sounds like > PIO to me. Sorry. One other bit of data from 2.6: [root@lap bitkeeper]# hdparm -i /dev/hda /dev/hda: Model=IBM-DJSA-220, FwRev=JS4OAC3A, SerialNo=44V44FT3300 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs } RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4 BuffType=DualPortCache, BuffSize=1874kB, MaxMultSect=16, MultSect=16 CurCHS=17475/15/63, CurSects=16513875, LBA=yes, LBAsects=39070080 IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 *udma2 udma3 udma4 AdvancedPM=yes: mode=0x80 (128) WriteCache=enabled Drive conforms to: ATA/ATAPI-5 T13 1321D revision 1: * signifies the current active mode