[quagga-users 12566] Re: bgp - quagga-0.99.18
if at xip.at
Fri Nov 11 15:35:03 GMT 2011
> On Nov 8, 2011, at 12:57 PM, Ingo Flaschberger wrote:
>> input ->| 1 mbit queue |-> output
>> small packet input
> There's rather more to the problem than what you do with small packets.
> And if you think that "the queue" is just 1mbit, you're mistaken - just
> at the level of one ethernet port's ring buffers, you could choose to
> configure 4096*9000 bytes of buffering. That alone could produce ~300ms
> of buffering on a gigabit interface. (Yes, that's generally unrealistic,
> but 4k*1500 bytes is not, and that still amounts to 50ms.) And that
> doesn't take into account the various other layers of buffering you may
> have in your system. Stick ten or twenty routers in between source and
> destination and you could have a real problem, if enough people make the
> wrong choices.
and the queue has 1 mbit!
ethernet-queues only fill if the router has not enough time to handle
packets - and the you have other problems than only slow pings.
and the 1 mbit queue only fill if you have traffic more than 1 mbit; if
not - it's nearly empty.
thats a queue - and no fixed time "delay", FIFO - not a shifting register.
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