From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Roskin Date: Thu, 13 Aug 2009 01:40:42 -0400 Subject: [ath9k-devel] Disconnect problem (DMA failed to stop in 10 ms) In-Reply-To: <19075.41714.450997.244874@gargle.gargle.HOWL> References: <74d457500908121816u57b86de6j8ea54f980cf7e75f@mail.gmail.com> <1250135145.4158.14.camel@mj> <19075.36493.238946.673381@gargle.gargle.HOWL> <1250137349.4158.48.camel@mj> <19075.41714.450997.244874@gargle.gargle.HOWL> Message-ID: <1250142042.2352.26.camel@ct> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ath9k-devel@lists.ath9k.org On Thu, 2009-08-13 at 10:51 +0530, Sujith wrote: > Pavel Roskin wrote: > > sync_cause is always 0x2000 when that message is printed, so there are > > no other causes. > > SYNC_LOCAL_TIMEOUT is generated when the PCIe core hangs, unable to complete > a DMA transfer. I am able to see this with 9280, 9281 and 9287. > So this seems to be a fundamental issue. Such issues are notoriously hard :-( If any ath9k version in the past didn't have that problem, I suggest bisection. Note that Michael noticed the performance degradation. That's another target for bisection, whether it's related or not. -- Regards, Pavel Roskin