On Tue, 27 May 2014, Hagen Paul Pfeifer wrote:
The question is if (codel/pie/whatever) AQM makes sense at all for
10G/40G hardware and higher performance irons? Igress/egress bandwidth
is nearly identical, a larger/longer buffering should not happen. Line
card memory is limited, a larger buffering is defacto excluded.
what if your router has more than two 40G interfaces? then you can have traffic
patters where traffic inbound on connections #1 and #2 are trying to go out #3
at a rate higher than it can handle.
At that point, you have two options
1. drop the packets
2. buffer them and hope that this is a temporary spike
if you buffer them, then the question of what queuing to use, simple FIFO,
codel, or ??? as well as how large the buffer should be allowed to grow before
you start dropping (at which point, which packets do you drop)
So I think that even on such big iron devices, there is room for the same sort
of queueing options as for lower speed connections, but processor speed and
memory size may limit how much you can do.
David Lang
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