[c-nsp] can't be -- output discards on 6500 gig-e

[Dmitri Kalintsev]

Ed,

Try to switch off your output flowcontrol and see if that helps. I'm not
saying it will, but just try it.

On Thu, Jul 29, 2004 at 11:36:40AM -0500, Edward Henigin wrote:
> Hello,
> 
> I've got a 6509/sup720 that's having output discards on a gigabit ethernet
> interface at peak time.  No biggie, you say, you're running the line
> too hot.  But what's "too hot?"  We're seeing the discards when the
> interface is doing 500Mbps on a 1 minute average.  I do not believe at
> all that we should be getting output discards at that traffic level.
> 
> The card is a WS-X6416-GBIC.  It has 10 ports enabled.  We constantly
> saw discards on the port at a rate of 40 to 70 packets/sec over a 3
> hour period.  During the same 3 hour period, the port was doing 450Mbps
> to 650Mbps, 40kpps - 55kpps, on a 5 minute average.
> 
> We opened a case with TAC and all they say is "you're running out of
> output buffers."  I'm sorry, but that's not helpful at all.  This behavior
> is unacceptable to me.  At 500Mbps, I should NOT be discarding packets,
> even at that low rate.
> 
> Send flowcontrol is on, receive flowcontrol is off.  By my reading of
> http://tinyurl.com/6omgc, that means that we will not process incoming
> pause packets, and we should not be pausing our output to the other side.
> So I don't believe that flowcontrol has anything to do with it.
> 
> Anyone else have any insight?
> 
> Thanks,
> 
> Ed
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---end quoted text---

SY,
-- 
D.K.