mirror of https://github.com/ARMmbed/mbed-os.git
ec2db62fe5
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. |
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