On 09/05/2012 12:21 PM, Arend van Spriel wrote: > On 09/05/2012 07:33 PM, Brad Figg wrote: >> On 09/05/2012 09:57 AM, Seth Forshee wrote: >>> On Wed, Sep 05, 2012 at 11:49:22AM +0200, Arend van Spriel wrote: >>>> This patch addresses a long standing issue of the driver with the >>>> mac80211 .flush() callback. Since implementing the .flush() callback >>>> a number of issues have been fixed, but a WARN_ON_ONCE() was still >>>> triggered because the flush takes too much time. The flush now >>>> makes use of a waitqueue and still has a timeout on which a warning >>>> is given. >>> >>> Brad Figg and I have been testing this patch with a 3.5 kernel. With the >>> patch we're both still seeing the warning from brcms_ops_flush(), and >>> Brad has also seen the "No where to go" message in >>> brcms_c_prec_enq_head(). But the connection continues to work when this >>> happens, whereas previously we had to reconnect, so this is definitely >>> an improvement. >>> >>> Seth >>> >> >> Arend, >> >> Though the driver is definitely better, it is still struggling quite a >> bit as can be seen in the iperf output found at: >> http://pastebin.ubuntu.com/1187578/ >> > > Thanks, Brad > > I was focusing on the warning in the flush callback. I actually could not reproduce the "nowhere to go" message under my ubuntu test laptop. > > The root cause of your problem seems the "nowhere to go". Basically, all packet queues in the driver have reached their limit. In that case packets are simply dropped. > > Could you provide following info: > * cpu info > * wireless device id > * scan data of your AP > * kernel configuration > > If I can download the kernel debian package of your 3.5 kernel from somewhere that would be great. > > Gr. AvS > Arend, I just filed https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1046507 which should contain all this information. If there is _anything_ more I can provide to you or test for you do not hesitate to ask. Brad -- Brad Figg brad.figg@xxxxxxxxxxxxx http://www.canonical.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
