From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: sata_mv port lockup on hotplug (kernel 2.6.38.2) Date: Mon, 25 Apr 2011 13:30:36 +0200 Message-ID: <20110425113036.GL17734@mtj.dyndns.org> References: <4D9CD275.9000002@teksavvy.com> <4D9FACC9.7020200@teksavvy.com> <4DA45CA7.9040102@teksavvy.com> <4DA467FB.6020905@teksavvy.com> <20110423005610.GC1576@mtj.dyndns.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail-ey0-f174.google.com ([209.85.215.174]:59989 "EHLO mail-ey0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758386Ab1DYLam (ORCPT ); Mon, 25 Apr 2011 07:30:42 -0400 Content-Disposition: inline In-Reply-To: Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Bruce Stenning Cc: Mark Lord , "linux-kernel@vger.kernel.org" , "linux-ide@vger.kernel.org" On Mon, Apr 25, 2011 at 12:07:04PM +0100, Bruce Stenning wrote: > Tejun, what does it mean to limit a sata link to UDMA/100? I thought that this > was only for ata devices, and sata devices have the choice of 1.5Gbps, 3Gbps, > or 6 Gbps. Is that a false assumption? Is it related to early sata devices that > were still somewhat based on parallel ata designs? Yeap, devices behind SATA-PATA bridge were still affected by the transfer mode so libata tries to slow them down too along with link speed when limiting speed due to errors. Shouldn't affect native SATA devices. -- tejun