Return-path: Received: from mail-oa0-f46.google.com ([209.85.219.46]:56729 "EHLO mail-oa0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751818Ab3BRQSh convert rfc822-to-8bit (ORCPT ); Mon, 18 Feb 2013 11:18:37 -0500 MIME-Version: 1.0 In-Reply-To: <1361156480-32566-1-git-send-email-Larry.Finger@lwfinger.net> References: <1361156480-32566-1-git-send-email-Larry.Finger@lwfinger.net> Date: Mon, 18 Feb 2013 17:18:34 +0100 Message-ID: (sfid-20130218_171841_471506_67D3228A) Subject: Re: [PATCH] b43: Increase number of RX DMA slots From: =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= To: Larry Finger Cc: linville@tuxdriver.com, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, Bastian Bittorf , Stable Content-Type: text/plain; charset=UTF-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: 2013/2/18 Larry Finger : > Bastian Bittorf reported that some of the silent freezes on a Linksys WRT54G > were due to overflow of the RX DMA ring buffer, which was created with 64 > slots. That finding reminded me that I was seeing similar crashed on a netbook, > which also has a relatively slow processor. After increasing the number of > slots to 128, runs on the netbook that previously failed now worked; however, > I found that 109 slots had been used in one test. For that reason, the number > of slots is being increased to 256. So probably ideal solution is to use 128 *and* fix the driver's failing on overflow ;) Did you try it on some old device? Just for sure firmware&DMA will handle it correctly. -- Rafał