Dear Amitkumar Karwar, some additional info. On Thu, Sep 11, 2014 at 5:09 PM, Amitkumar Karwar <akarwar@xxxxxxxxxxx> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
