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Re: [lwip-users] TCP Retransmission when receiving consecutive packets

From: Sergio R. Caprile
Subject: Re: [lwip-users] TCP Retransmission when receiving consecutive packets
Date: Thu, 20 Mar 2014 15:13:22 -0300
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:24.0) Gecko/20100101 Thunderbird/24.3.0

Yes Jens, looks like you are absolutely right, missed that, there is no
frame loss here, the receiving process must be getting only the first
frame in the "chip" cue.

Julien is using some ST microcontroller, I guess it has a built-in eth
controller, probably with DMA.

I've studied the Linux drivers for the DM9000 to write my driver, and
I've seen they read all the packets out of the chip every time; then I
setup a simple test to see if interrupts would trigger on every frame or
only on empty buffer, and guess what... empty buffer only (there is no
int ack here)

Looks like we've got a different situation here, the chip seems to be
issuing an interrupt after the first one is ACKed, as you Jens described
for your case.

Julien, can you confirm this from the chip docs ?
Pitty one has to fix the drivers for a manufacturer, maybe someone in ST
can lend a hand ?


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