I guess the answer to this is obvious to the more cynically minded, but I
had naively hoped that the FEIP2 card would be capable of reaching close
to 100 Mbps when set to full duplex.
Among others we have an FEIP2 card in a 7507. The 7507 has an RSP4 which
is sitting at 18% CPU. There is 90 MB of RAM free. All of the interfaces
have been set to have hold-que in and out of 512. Small, middle, and big
buffers have been increased to 2000 each.
When we increase traffic to 65 Mbps in and 15 Mbps out (from about 55 Mbps
in and 10 Mbps out) on this specific interface we start seeing ignores
race along at the rate of several hundred per second (this translates to
packet loss). While this is happening we are not seeing buffer failures
or drops on the input or output queues of the other interfaces. That
makes no sense. Supposedly you should only see ignores when allocation of
buffer or queue space repeatedly fails. We do see throttled increasing
(sh cont cbus) (Normally it doesn't, of course).
The other end of the interface is full duplex, we are not seeing any other
errors of any type.
The only thing we haven't tried is setting "transmit-buffers
backing-store" on all of the interfaces.
I've spent several days trying to debug this and banging my head against
the wall for what I thought should be obvious. I feel used by cisco for
sticking a 100 Mbps card in a router with a 1 Gbps backplane and not being
able to get even 65 Mbps through it. Perhaps I am just missing the
obvious...
Suggestions???
Mike.
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