From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 30 Oct 2000 07:07:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 30 Oct 2000 07:07:29 -0500 Received: from deckard.concept-micro.com ([62.161.229.193]:10306 "EHLO deckard.concept-micro.com") by vger.kernel.org with ESMTP id ; Mon, 30 Oct 2000 07:07:24 -0500 Message-ID: X-Mailer: XFMail 1.4.4 on Linux X-Priority: 3 (Normal) Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <39FCB13E.6267C38D@haque.net> Date: Mon, 30 Oct 2000 13:09:43 +0200 (CET) X-Face: #eTSL0BRng*(!i1R^[)oey6`SJHR{3Sf4dc;"=af8%%;d"%\#"Hh0#lYfJBcm28zu3r^/H^ d6!9/eElH'p0'*,L3jz_UHGw"+[c1~ceJxAr(^+{(}|DTZ"],r[jSnwQz$/K&@MT^?J#p"n[J>^O[\ "%*lo](u?0p=T:P9g(ta[hH@uvv Organization: Concept Micro From: Pierre Etchemaite To: "Mohammad A. Haque" Subject: RE: ide/disk perf? Cc: linux-kernel Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Le 30-Oct-2000, Mohammad A. Haque écrivait : > Could someone who knows ide and drive inside and out (Andre?) please > take a look at these figures? Am I forgetting to do something (or doing > something I'm not suposed to) to get the best numbers? I thought I'd be > able to get more than ~4MB/sec off the HPT366 and a UDMA66 drive. It could be unrelated, but I had problems several times with Maxtor drives recently; Their performances are usually high (some models give >20 Mb/s both reads and writes), but under some conditions that I couldn't narrow down yet, the read throughput is stuck to the floor (a few megabytes/sec) until next reboot. The write performance is always ok. I don't think it's a chipset problem, with a box filled with several Maxtor drives and I observe the problem with some disk and not others at the same time. I don't think it's a Linux problem either, since it can be observed with Windows benchmarking tools too. As a side note, I usually get better results tweaking disks using kernel compiling options ("default to DMA", "autotune chipset", ...) than using hdparm -d1 and friends, give it a try. -- Linux blade.workgroup 2.4.0-test10 #1 Sat Oct 28 18:00:09 CEST 2000 i686 unknown 1:09pm up 1 day, 19:01, 2 users, load average: 1.04, 1.08, 1.09 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/