From: Jeff Garzik Subject: Re: [GIT PULL] Ext3 latency fixes Date: Mon, 06 Apr 2009 01:47:33 -0400 Message-ID: <49D99775.9030104@garzik.org> References: <20090404135719.GA9812@mit.edu> <20090404151649.GE5178@kernel.dk> <20090404173412.GF5178@kernel.dk> <20090404180108.GH5178@kernel.dk> <20090404232222.GA7480@mit.edu> <20090404163349.20df1208@infradead.org> <20090405001005.GA7553@mit.edu> <49D8E71F.6000703@rtr.ca> <49D91B31.90300@garzik.org> <20090405164831.7ad01c20@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Mark Lord , Linus Torvalds , Theodore Tso , Jens Axboe , Linux Kernel Developers List , Ext4 Developers List To: Arjan van de Ven Return-path: Received: from srv5.dvmed.net ([207.36.208.214]:40537 "EHLO mail.dvmed.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751872AbZDFFsH (ORCPT ); Mon, 6 Apr 2009 01:48:07 -0400 In-Reply-To: <20090405164831.7ad01c20@infradead.org> Sender: linux-ext4-owner@vger.kernel.org List-ID: Arjan van de Ven wrote: > On Sun, 05 Apr 2009 16:57:21 -0400 > Jeff Garzik wrote: >> We set it in libata-scsi.c:ata_scsi_dev_config() based on >> ata_id_is_ssd() >> >> That hueristic probably assumes Intel SSDs or something :/ > > you mean the "rpm" set to '1' ? > I was pretty sure that that was industry standard... A -new- industry standard. You can certainly create a compliant SSD while only conforming to ATA-7, for example. Some older IDE flash devices pretend they are normal hard drives in almost every respect, too. Jeff