Ping stress (>=990 bytes)

Keith Robertson kjrobert at
Mon Aug 18 16:41:11 UTC 2008

Gene Smith wrote:
> Another question on dropped packets. I am able to ping (even flood ping) 
> up to a length of 980 bytes with no loss. When I go over this my tcp/ip 
> stack seem to go bad. Regular pings (56 bytes) sometimes don't respond, 
> or responds with a huge amount of data (1022 bytes). Is there a maximum 
> ping length in rtems?  I see no bad stats in netdemo. My (newly made) 
> driver has buffers for 1536 bytes.
> Wondering if others can ping the rtems stack with >=990 bytes?

On rtems 4.8.1 (and earlier as well), I can successfully ping rtems 
devices with packets of 65507 bytes (the icmp max).  It takes longer, 
but it works fine.

This is on the powerpc/virtex bsp.


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