I'm trying to figure out what parameter(s) are deficient in my configuration by
looking at Stats, presumably the MEM_STATS and MEMP_STATS. I also want to
eventually shrink memory usage by lwIP as much as possible; every KB counts. A
few seconds into receiving data, the stack starts dropping packets and sending
duplicate ACKs. The last config I used is below, although I'm tweaking things
almost constantly.
I'm receiving streaming TCP data, so nothing is being sent except for an
initial request. In looking at lwip_stats.memp[x], where x is 0 thru 5, I'm
able to sort of match up each section with my config. 5 seems to be
PBUF_POOL_SIZE, 4 is MEMP_NUM_PBUF, etc....at least that's what it seems like.
I've went thru the code but wasn't able to figure out what each one is (I'm not
that good at C). Anyway, neither mem nor memp are indicating errors. And
memp[5] only maxed at 12 out of 20.
Are my assumptions correct, and what are the other parts of the memp array
displaying? Also, is there any other reason for dropping packets/duplicate
ACKs, and what is a good way to track that down (with respect to what I can set
in lwipopts.h)?
#define PBUF_POOL_SIZE 20
#define TCP_MSS 1460
#define TCP_SND_BUF (TCP_MSS * 4)
#define PBUF_POOL_BUFSIZE 256
#define TCP_WND (1460*2)
#define MEM_SIZE 512
#define MEMP_NUM_PBUF 12
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