Commits on May 11, 2018

1. lwIP: Enable TCP out-of-order processing …

   Our config file for lwIP had TCP_QUEUE_OOSEQ disabled - this can
   cause significant performance problems, as observed during testing.
   
   One lost packet can lock an input stream into a mode where the
   transmitter keeps thinking packets are being lost, so keeps slowing
   down. This caused test failures - a transfer that would normally
   take 10s hit a 60s timeout.
   
   Turning this on increases code size, but doesn't significantly increase
   static memory use. The memory used for out-of-order packets comes from
   the same pbuf pool as for outgoing TCP segments, so there is contention
   when running bidirectionally.
   
   Out-of-order processing is on by default for lwIP - this seems to be
   another example of us excessively paring it back.

   

   kjbracey committed May 11, 2018
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