[c-nsp] FE ignored errors

[Gert Doering]

Hi,

On Sun, Dec 19, 2004 at 06:10:19PM -0500, Jon Lewis wrote:
> I've recently started seeing large bursts (sometimes tens, usually
> thousands) of input ignored errors on several 7500 routers FE
> interfaces (rsp4, vip2-50, PA-FE-TX).  It's even happening on relatively
> low traffic ones that are only doing about 1/5 line rate traffic.

We do also see them (on NPE-400/PA-FA-TX and on 7500/VIP2-50/PA-FE-TX).

My personal suspicion is that it's short bursts of "*lots* of small
packets" - like "100 Mbit/s. flat for 10 seconds" - that cause some
sort of buffer shortage, and thus input ignores.

I've done some fiddling with hold-queues and buffers and whatnot (before
reading Rodney's posting that one shouldn't do it) - but it didn't have
any significant effect.  So I'm reading this list and hoping that someone
else will come up with the magic bullet...

gert

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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de