packets being dropped in IP stack but no error counts incrementing?

From: Chris Friesen (cfriesen@nortelnetworks.com)
Date: Tue Jun 04 2002 - 13:07:52 EST

I've been doing some testing on 2.4.18 and I'm seeing an interesting problem.

I have a test tool that simulates bursty UDP traffic by sending a bunch of
messages and then delaying a while. If I leave the receiving udp socket at its
normal size, then I can get a significant number of messages just vanishing
between the ethernet driver and the userspace socket. The driver rx count shows
that all packets were received, but the userspace program doesn't get all of
them. netstat/ifconfig/iproute2 rx dropped counts do not increase.

Is this design intent, are we messing a counter increment when dropping packets,
or am I not looking at the right counter for these numbers?

Thanks,

Chris 

-- 
Chris Friesen                    | MailStop: 043/33/F10  
Nortel Networks                  | work: (613) 765-0557
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