From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Lord Subject: Re: [PATCHSET #upstream-fixes] libata: improve flaky link handling Date: Thu, 29 Jan 2009 10:50:02 -0500 Message-ID: <4981D02A.8030001@rtr.ca> References: <1233228696-10562-1-git-send-email-tj@kernel.org> <87f94c370901290607t4cef87ack43fd456d1703d1ca@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from rtr.ca ([76.10.145.34]:60049 "EHLO mail.rtr.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758405AbZA2PuE (ORCPT ); Thu, 29 Jan 2009 10:50:04 -0500 In-Reply-To: <87f94c370901290607t4cef87ack43fd456d1703d1ca@mail.gmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Greg Freemyer Cc: Tejun Heo , jeff@garzik.org, linux-ide@vger.kernel.org Greg Freemyer wrote: > On Thu, Jan 29, 2009 at 6:31 AM, Tejun Heo wrote: >> Hello, >> >> This patchset is kicked off by kernel bz#9913 which reports hot >> plugging and general detection problems with WD My Book drives. WD >> was kind enough to provide me with these drives and I played quite a >> bit with a few controllers and weird cabling configurations including >> long cables and several genders. >> >> It was surprisingly easy to trigger link layer problems. eSATA ports >> often go through extra cable and gender. eSATA cables tend to be >> longer than internal ones and as the cables are much stiffer touching >> or moving the cable can easily cause enough wiggle at the connectors >> to cause temporary transmission problems and being outside, it's much >> more likely to be moved. >> >> So, with abundant link quality problems, the following problems have >> been identified. > Tejun, > > This looks like an important patchset for those of us that use eSata. > Any chance these can get into the opensuse 11.1 kernels? Or lacking > that, the os factory kernels? .. Based on experience here, I'd say the problem isn't terribly widespread beyond the specific vendor Tejun identified. I have several eSATA setups at hand here, and never see flaky link behaviour on them. Cheers