[lwip-devel] [bug #50914] TCP server don't update the ack num

[Simon Goldschmidt]

Follow-up Comment #12, bug #50914 (project lwip):

LWIP_CHECKSUM_ON_COPY
== 1: for headers, checksum is calculated byte by byte when the header is
filled; for data, checksum is created during memcpy when the data is already
in the processor's registers
== 0: first headers and data are put in place and just before transmitting,
checksum is created by fetching all bytes into the processor's registers again
and summing them up.

Clearly, checksum-on-copy should be faster, which is why it is the default.
However, your log output indicates there's a problem with this and the
generated checksum is off by one.

Could you post such a log? Hopefully, I can see which segments sizes where
sent.

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