Re: [lwip-users] Throughput benchmark question - nasty pauses

[address@hidden]

Am 28.02.2019 um 17:42 schrieb Dave Nadler:
> I naively expected that after receiving the" duplicate ack" signalling a 
> packet dropped,
> LwIP would immediately re-transmit the dropped packet.

No, TCP fast retransmission starts after 3 dupacks only.

> Instead there is a 1.5 second pause (see Wireshark trace below).
> Why is that?

Yeah, that's a little strange. I would have expected ~250ms for the RTO 
retransmission, but then again, it depends on your roundtrip time. But 
it could well be 1.5 seconds because your timers are not coming at the 
expected interval?

Regards,
Simon