[c-nsp] 6500 (Sup7203-bxl / 6724-SFP) Input queue drops

joshua sahala jsahala at gmail.com
Wed Dec 9 15:07:14 EST 2009


drew,

it may or may not be related, but...check the output of 'sh counter
int <int> [delta]' and look at the qos[1-21][In|Out]lost counters.

i was experiencing various drops due to the default interface (qos)
buffer allocation:  basically, all of my traffic was hitting the 76xx
swouter in the q0 buffer and overrunning it (there were no drops in
any of the other qos queues because no traffic was ever hitting them).
 i ended up having to rewrite the buffer mapping to allocate
everything to q0 and the random discards stopped (at least the ones
caused by this issue).

hth,
/joshua
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