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* [Cake] Lockup at high speeds
@ 2018-06-01 17:46 Toke Høiland-Jørgensen
  2018-06-01 17:49 ` Jonathan Morton
  0 siblings, 1 reply; 14+ messages in thread
From: Toke Høiland-Jørgensen @ 2018-06-01 17:46 UTC (permalink / raw)
  To: cake

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?

-Toke

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

^ permalink raw reply	[flat|nested] 14+ messages in thread

end of thread, other threads:[~2018-06-05 14:24 UTC | newest]

Thread overview: 14+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-06-01 17:46 [Cake] Lockup at high speeds Toke Høiland-Jørgensen
2018-06-01 17:49 ` Jonathan Morton
2018-06-01 17:53   ` Toke Høiland-Jørgensen
2018-06-01 19:03     ` Georgios Amanakis
2018-06-01 19:23       ` Toke Høiland-Jørgensen
     [not found]         ` <9A273CA6-FDF6-485D-B466-8B01D4573BD9@gmail.com>
2018-06-01 19:58           ` Toke Høiland-Jørgensen
2018-06-02 17:08             ` Dave Taht
2018-06-02 18:21               ` Toke Høiland-Jørgensen
2018-06-02 18:55                 ` Dave Taht
2018-06-02 19:25                   ` Toke Høiland-Jørgensen
2018-06-03 14:56                     ` Georgios Amanakis
2018-06-03 23:26                       ` Toke Høiland-Jørgensen
2018-06-05 11:46                         ` Pete Heist
2018-06-05 14:24                           ` Pete Heist

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