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Re: [lwip-users] Ethernet - all packets over 32 dropped

From: address@hidden
Subject: Re: [lwip-users] Ethernet - all packets over 32 dropped
Date: Mon, 19 Oct 2009 21:24:18 +0200
User-agent: Thunderbird (Macintosh/20090812)

bobbyb wrote:
Iperf is a common application used for testing network bandwidth
(http://en.wikipedia.org/wiki/Iperf for more details). xapp1026 provides a
utxperf which allows you to setup an iperf server which basically just spams
packets as fast as it can to determine maximum bandwidth. This application
works fine for me.
I knew what iperf is, but I didn't know it was ported to lwIP (and escpecially the raw API).
I am using the raw api with my pbufs setup just as in the iperf example -
Although that might not have anything to do with your problem, using PBUF_POOL for TX is not a good idea: at least with TCP, you risk deadlocks when running out of pbufs as incoming ACK segments can not be received to free allocated pbufs (if the pool is empty).
The pbuf_pool_size is set to
256 and the pbuf_pool_bufsize is set to 1600. I am using lwip v1.3 which i
believe is equivalent to lwip v3.0 with some xilinx specific changes. This
is the exact setup i use to run iperf too which is why i'm very confused.
Try using pbuf_alloc(PBUF_RAW, SEND_BUFSIZE, PBUF_RAM) instead. Oh, and you didn't say if it sends 32 bytes of data or 32 bytes total.


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