North American Network Operators Group
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Re: The Qos PipeDream [Was: RE: Two Tiered Internet]

  • From: Joe Maimon
  • Date: Sun Dec 18 14:29:42 2005 

Chris Woodfield wrote:

One thing to note here is that while VoIP flows are low volume on a bits-per-second basis, they push substantially more packets per kilobit than other traffic types - as much as 50pps per 82Kbps flow. And I have seen cases of older line cards approaching their pps limits when handling large numbers of VoIP flows even though there's plenty of throughput headroom. That's not something LLQ or priority queueing are going to be able to help you mitigate at all.

-C
In that vein, and not quite on this topic, it would be real nice if voip applications made an effort to stop abusing networks with unneccessarily large pps.

Something about intelligent edges? The payload length of voip applications often has a lot to do with rtt. Adapting payload length to the actuall average rtt could have a positive effect on pps throughput.