On Sun, Oct 05, 2014 at 04:57:12PM +0300, Emmanuel Grumbach wrote: > When mac80211 wants to ensure that a frame is sent, it calls > the flush() callback. Until now, iwldvm implemented this by > waiting that all the frames are sent (ACKed or timeout). > In case of weak signal, this can take a significant amount > of time, delaying the next connection (in case of roaming). > Many users have reported that the flush would take too long > leading to the following error messages to be printed: > > iwlwifi 0000:03:00.0: fail to flush all tx fifo queues Q 2 > iwlwifi 0000:03:00.0: Current SW read_ptr 161 write_ptr 201 > iwl data: 00000000: 00 00 00 00 00 00 00 00 fe ff 01 00 00 00 00 00 > [snip] > iwlwifi 0000:03:00.0: FH TRBs(0) = 0x00000000 > [snip] > iwlwifi 0000:03:00.0: Q 0 is active and mapped to fifo 3 ra_tid 0x0000 [9,9] > [snip] > > Instead of waiting for these packets, simply drop them. This > significantly improves the responsiveness of the network. > Note that all the queues are flushed, but the VO one. This > is not typically used by the applications and it likely > contains management frames that are useful for connection > or roaming. > > This bug is tracked here: > https://bugzilla.kernel.org/show_bug.cgi?id=56581 > > But it is duplicated in distributions' trackers. > A simple search in Ubuntu's database led to these bugs: > > https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/1270808 > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1305406 > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1356236 > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1360597 > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1361809 > > Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx> > --- > I am trying here to fix an issues that has been affecting many users on dvm. > A few users in bugzilla already reported that this patch helped them a lot. > I am trying to get more testers :) I'll post test builds to the Ubuntu bugs and see if I can get any testing. Thanks, Seth -- 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
