em driver issues

[Matthew Dillon]

:In a message dated 2/3/05 1:01:46 PM Eastern Standard Time, 
:dillon at xxxxxxxxxxxxxxxxxxxx writes:
: >   I've got a bunch of boxes with the em card in it.  Could you describe
: >   how you are generating the packet stream to cause the panic ?
:
:Its just a traffic generator that send packets to an unused udp port on the 
:target machine. It generates approx 145K pps and I had it set to use a
:300 byte random payload. I happen to have the udp dport set to 189, but
:I doubt it matters. I have it wired directly, a freebsd 4.9 box generating and
:the dragonfly receiving on a gig link. 
:
:I got a NULL POINTER error, so its probably something with the ring overflow, 
:or maybe running out of mbuf clusters? There were no other error messages.
:It should be easy to duplicate, and not hard for me to debug once I compile
:DDB into my kernel.
:
:The same test on FBSD 4.9 and 4.10 work fine, so thats why I asked if an
:effort was underway to get the FreeBSD updates into dragonfly,as they may
:fix the problem.
:
:EM

    This sounds like a network stack/mbuf issue.  Could you please post 
    the backtrace of the panic ? 

						-Matt