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[lwip-devel] [bug #34426] TCP retransmission transmits 1 byte instead of


From: Min Xu
Subject: [lwip-devel] [bug #34426] TCP retransmission transmits 1 byte instead of original packet, with incorrect byte value
Date: Thu, 29 Sep 2011 21:10:37 +0000
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:7.0) Gecko/20100101 Firefox/7.0

Follow-up Comment #3, bug #34426 (project lwip):

Per your question "why does lwIP's TCP not enter fast-retransmission after
receiving 2 dupacks", quote from the ARP flooding bug entry:

the DSP main loop polls the drive receive function (to see if
there are packets already received by DMA/Interrupt) with a priority of 4096
-- it polls the receive function 4096 times,  OR until the polling function
returns false, indicating there are no packets [whole or broken..].  So if the
LwIP stack spends a lot of time in the tcp_output routine (to write out to
the
ethernet, arp or tcp packets) it won't be able to processing incoming ARP
response and/or ACK / DupACK messages until it's done.

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