From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: [PATCH] speed up SATA Date: Sun, 28 Mar 2004 15:45:04 -0500 Sender: linux-ide-owner@vger.kernel.org Message-ID: <40673950.4050703@pobox.com> References: <4066021A.20308@pobox.com> <200403282030.11743.bzolnier@elka.pw.edu.pl> <20040328183010.GQ24370@suse.de> <200403282045.07246.bzolnier@elka.pw.edu.pl> <406720A7.1050501@pobox.com> <20040328123240.4332964e.akpm@osdl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from parcelfarce.linux.theplanet.co.uk ([195.92.249.252]:59360 "EHLO www.linux.org.uk") by vger.kernel.org with ESMTP id S262046AbUC1UpV (ORCPT ); Sun, 28 Mar 2004 15:45:21 -0500 In-Reply-To: <20040328123240.4332964e.akpm@osdl.org> List-Id: linux-ide@vger.kernel.org To: Andrew Morton Cc: B.Zolnierkiewicz@elka.pw.edu.pl, axboe@suse.de, wli@holomorphy.com, nickpiggin@yahoo.com.au, linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org Andrew Morton wrote: > Jeff Garzik wrote: > >> I like generic tunables such as "laptop mode" or "low latency" or "high >> throughput". These sorts of tunables should affect the "automagic" >> calculations. > > > Not sure. Things like "low latency" and "high throughput" may need other > things, such as "seek latency" and "bandwidth" as _inputs_, not as outputs. I should probably better define the hypotheticals :) I think of "laptop mode" or "low latency versus high throughput" more as high level binary flags, influencing widely varying things like from an ATA disk's "low noise versus high performance" tunable to the IO scheduler's deadlines. > Such device parameters should have reasonable defaults, and use a userspace > app which runs a quick seek latency and bandwidth test at mount-time, > poking the results into sysfs. Certainly... Jeff