Hi Alex, I found that tx_queue_len is exported to sysfs /sys/class/net/wpan0/tx_queue_len
So I tried a few values. first a value of 50 and all was well in that pings still worked. So I tried to ssh from one board to the other ssh -6 root@fe80::a200:0:0:1%lowpan0 and it locked up. So I rebooted and increased tx_queue_len to 600 and this time I could ssh from one board to the other. I don't understand why filling up the tx queue should cause a lock up, I'll have a look through the tx queuing source code and see if there's something my driver is doing that is upsetting it. I don't suppose you could try a low tx_queue_len and see if you can get it to lock up by using ssh. Cheers, Martin. On 14/02/14 09:25, Alexander Aring wrote: > On Fri, Feb 14, 2014 at 09:07:03AM +0000, Martin Townsend wrote: >> Hi Alex, >> >> After a bit a googling it looks like tx_queue_len is the number of skb's >> that the transmit queue can hold whilst it is stopped. Is this correct? >> I'll try a smaller value and see if it locks up quicker and then try >> increasing it. I would have thought 300 would have been ample for a ping. >> :) >> > mhh, I thought maybe your device is too slow to transmit all skb and > then it reachs the 300 skb which are hold in the tx queue. > >> I had a thought, when you did your overnight testing did you see any packet >> loss or do you have the devices fairly close to each other? it's just that >> on our boards we have no CCA yet transmitting packets over powerline which >> is fairly hostile so there are probably quite a few packets being lost over >> a long period, I'm wondering if this is why I'm seeing the lock ups and you >> are not. >> >> Another thing I do is to decrease the interval on the ping6 using -i 0.3 to >> try and stress things a bit more. >> > I will start an 2 hours test with my atusb devices right now. I will > use: > > ping6 -i 0.3 -s 1000 fe80::a8aa:aaaa:aaaa:aabb%lowpan0 > > with: > > ping6 utility, iputils-s20121221 > > I will report the drop, error rate. > > - Alex ------------------------------------------------------------------------------ Android apps run on BlackBerry 10 Introducing the new BlackBerry 10.2.1 Runtime for Android apps. Now with support for Jelly Bean, Bluetooth, Mapview and more. Get your Android app in front of a whole new audience. Start now. http://pubads.g.doubleclick.net/gampad/clk?id=124407151&iu=/4140/ostg.clktrk _______________________________________________ Linux-zigbee-devel mailing list Linux-zigbee-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-zigbee-devel
