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

From: bobbyb
Subject: Re: [lwip-users] Ethernet - all packets over 32 dropped
Date: Mon, 19 Oct 2009 11:41:48 -0700 (PDT)

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 am using the raw api with my pbufs setup just as in the iperf example -
pbuf_alloc(PBUF_RAW, SEND_BUFSIZE, PBUF_POOL). 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.

address@hidden wrote:
> You should provide a little more information about your application (not 
> everyone knows the "provided iperf application", I guess - at least noe 
> me!):
> - What API are you using (sockets, netconn, raw)?
> - If using raw API, which type of pbuf are you using? (For outgoing 
> data, you should use a PBUF_RAM pbuf)
> - What is the pbuf pool size set to (PBUF_POOL_BUFSIZE define)
> - Which version of lwIP are you using?
> At least with the default options, there should be more space than 32 
> bytes in the first pbuf (if using a chain), so this might well be a 
> problem of the MAC driver, too.
> Having this info, maybe we can help more.
> Simon
> bobbyb wrote:
>> I have setup ethernet communication using the xps_ll_temac on a virtex 5
>> and
>> am using the lwip tcpip stack. Everything works fine when running the
>> provided iperf application, but when I run my own slightly modified code,
>> it
>> sends exactly 32 packets every time and drops the rest. Ive tried
>> changing
>> the number of udp_pcbs, pbufs and memory for pbufs all of which did
>> nothing.
>> Has anyone encountered a problem like this? Any ideas what could be
>> causing
>> this? Thanks
> _______________________________________________
> lwip-users mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/lwip-users

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