[Cake] Lockup at high speeds
toke at toke.dk
Fri Jun 1 13:46:40 EDT 2018
As you may have seen, I hit a lockup bug when testing Cake at high
speeds. I am not quite sure what is happening, but we seem to be looping
forever either in cake_dequeue() or cake_enqueue(), causing deadlocks.
Unfortunately, I have no more time to debug this for now. As far as I
can tell, it only seems to be happening as the shaped rate approaches or
exceeds the link speed, or when running in unlimited mode. So for all I
know it might be possible to trigger it at lower speeds as well...
Anyone with any bright ideas?
P.S. While testing this, I did manage to get some high speed results
before everything blew up on me:
Summary of tcp_4up test run 'Cake 40gbps' (at 2018-06-01 17:36:19.216149):
avg median # data pts
Ping (ms) ICMP : 0.36 0.12 ms 197
TCP upload avg : 9563.03 9563.95 Mbits/s 151
TCP upload sum : 38252.11 38255.80 Mbits/s 151
TCP upload::1 : 9686.85 9674.40 Mbits/s 150
TCP upload::2 : 9444.94 9460.09 Mbits/s 150
TCP upload::3 : 9438.95 9461.36 Mbits/s 150
TCP upload::4 : 9681.37 9675.69 Mbits/s 150
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