From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265079AbUEYThY (ORCPT ); Tue, 25 May 2004 15:37:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265080AbUEYThY (ORCPT ); Tue, 25 May 2004 15:37:24 -0400 Received: from cantor.suse.de ([195.135.220.2]:36052 "EHLO Cantor.suse.de") by vger.kernel.org with ESMTP id S265079AbUEYTge (ORCPT ); Tue, 25 May 2004 15:36:34 -0400 Date: Tue, 25 May 2004 21:34:58 +0200 From: Olaf Hering To: "Richard B. Johnson" Cc: linux-kernel@vger.kernel.org Subject: Re: very low performance on SCSI disks if device node is in tmpfs Message-ID: <20040525193458.GA21120@suse.de> References: <20040525184732.GB26661@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-DOS: I got your 640K Real Mode Right Here Buddy! X-Homeland-Security: You are not supposed to read this line! You are a terrorist! User-Agent: Mutt und vi sind doch schneller als Notes Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 25, Richard B. Johnson wrote unrelated stuff: did you actually try it? (none):~ # /usr/bin/time dd if=/dev/sdb bs=1M count=123 of=/dev/null 123+0 records in 123+0 records out 0.00user 0.75system 0:17.13elapsed 4%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (0major+426minor)pagefaults 0swaps (none):~ # /usr/bin/time dd if=/dev/sdb bs=1M count=123 of=/dev/null 123+0 records in 123+0 records out 0.00user 0.74system 0:15.66elapsed 4%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (0major+426minor)pagefaults 0swaps (none):~ # /usr/bin/time dd if=/dev/sdb bs=1M count=123 of=/dev/null 123+0 records in 123+0 records out 0.00user 0.78system 0:15.67elapsed 5%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (0major+426minor)pagefaults 0swaps (none):~ # /usr/bin/time dd if=/tmp/sdb bs=1M count=123 of=/dev/null 123+0 records in 123+0 records out 0.00user 0.47system 0:06.44elapsed 7%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (0major+426minor)pagefaults 0swaps (none):~ # /usr/bin/time dd if=/tmp/sdb bs=1M count=123 of=/dev/null 123+0 records in 123+0 records out 0.00user 0.47system 0:06.44elapsed 7%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (0major+426minor)pagefaults 0swaps (none):~ # /usr/bin/time dd if=/tmp/sdb bs=1M count=123 of=/dev/null 123+0 records in 123+0 records out 0.00user 0.50system 0:06.44elapsed 7%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (0major+426minor)pagefaults 0swaps -- USB is for mice, FireWire is for men! sUse lINUX ag, nÜRNBERG