Return-path: Received: from mail-wi0-f174.google.com ([209.85.212.174]:54481 "EHLO mail-wi0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751938AbaIQJ5O (ORCPT ); Wed, 17 Sep 2014 05:57:14 -0400 Received: by mail-wi0-f174.google.com with SMTP id n3so876897wiv.1 for ; Wed, 17 Sep 2014 02:57:12 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <5FF020A1CFFEEC49BD1E09530C4FF5951819DB12F1@SC-VEXCH1.marvell.com> References: <5FF020A1CFFEEC49BD1E09530C4FF5951819DB12F1@SC-VEXCH1.marvell.com> Date: Wed, 17 Sep 2014 11:57:12 +0200 Message-ID: (sfid-20140917_115722_821158_37E9D09A) Subject: Re: mwifiex_usb_submit_rx_urb: dev_alloc_skb failed when conected to 5GHz From: Belisko Marek To: Amitkumar Karwar Cc: "linux-wireless@vger.kernel.org" , Avinash Patil Content-Type: text/plain; charset=UTF-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: Dear Amitkumar Karwar, some additional info. On Thu, Sep 11, 2014 at 5:09 PM, Amitkumar Karwar wrote: > Hi BR, > >> >> I'm using 3.9 mainline mwifiex driver for wireless usb card. Doing some >> throughput testing (with iperf) in 5GHz I got following failures: >> [ 221.521799] usb 1-1: mwifiex_usb_submit_rx_urb: dev_alloc_skb failed > > This is skb allocation failure returned by kernel. 4k buffer is always allocated for Rx packets. This issue doesn't seem to be specific to 5Ghz. Yes you're right. I can reproduce issue also with 2.4GHz (doing iperf testing as mentioned in other email) by pinging device with card. > >> >> I checked which which size fails to allocate and it's 4096 bytes. I was >> looking to changes in never kernel releases but I cannot find anything >> obvious. When connected to 2.4GHz I cannot reproduce issue though. I'm >> using FW version mwifiex 1.0 (14.68.29.p26). >> > > Could you please provide the platform details? > How often the problem occurs during throughput testing? Are there any specific steps? One more observation is that when problem occurred complete system is unresponsive (console is almost completely dead). I can workaround issue by decreasing iperf bandwidth to ~40m. I think in this situation we're running out of memory by exhaustive skb allocations. > > Regards, > Amitkumar Karwar BR, marek -- as simple and primitive as possible ------------------------------------------------- Marek Belisko - OPEN-NANDRA Freelance Developer Ruska Nova Ves 219 | Presov, 08005 Slovak Republic Tel: +421 915 052 184 skype: marekwhite twitter: #opennandra web: http://open-nandra.com