nanog mailing list archives
Re: QoS/CoS in the real world?
From: Bill Nickless <nickless () mcs anl gov>
Date: Tue, 16 Jul 2002 17:00:42 +0900
At 11:13 AM 7/15/2002 -0400, Art Houle wrote:
We are using QOS to preferentially drop packets that represent file-sharing (kazaa, gnutella, etc). This saves us 40Mbps of traffic across our multiple congested WAN links. The trick is to mark packets meaningfully. Also, the WFQ introduces some additional latency at our edge.
That's exactly the right phrase: "We are using QOS to preferentially drop packets...."
When my research customers come to me wanting QoS, I can usually screen out the silly requests from the serious requests by asking "OK how can I tell which packets are less important and should be dropped?"
If they say "someone's packets other than mine" I nod and smile politely.However, the Access Grid application runs both video and audio. The AG folks can very easily mark the packets for video and audio, and are quite happy to drop video packets in order to get the audio clear. AG users really truly want good audio at the expense of high quality video.
To this point we haven't actually implemented it, but it's a nice option to have in one's back pocket to pull out when it's really needed.
=== Bill Nickless http://www.mcs.anl.gov/people/nickless +1 630 252 7390 PGP:0E 0F 16 80 C5 B1 69 52 E1 44 1A A5 0E 1B 74 F7 nickless () mcs anl gov
Current thread:
- QoS/CoS in the real world? Stephen J. Wilcox (Jul 08)
- Re: QoS/CoS in the real world? Nathan Stratton (Jul 08)
- Re: QoS/CoS in the real world? Stephen J. Wilcox (Jul 13)
- Re: QoS/CoS in the real world? Marshall Eubanks (Jul 13)
- Re: QoS/CoS in the real world? Art Houle (Jul 14)
- Re: QoS/CoS in the real world? Marshall Eubanks (Jul 14)
- Re: QoS/CoS in the real world? Art Houle (Jul 14)
- Re: QoS/CoS in the real world? Peter John Hill (Jul 15)
- Re: QoS/CoS in the real world? Bill Nickless (Jul 16)
- Re: QoS/CoS in the real world? Kurt Erik Lindqvist (Jul 15)
- Re: QoS/CoS in the real world? Randy Bush (Jul 15)
- Re: QoS/CoS in the real world? JC Dill (Jul 13)
- Real World Data: Re: QoS/CoS in the real world? Sean Donelan (Jul 13)
- Re: QoS/CoS in the real world? Stephen J. Wilcox (Jul 14)
- <Possible follow-ups>
- Re: QoS/CoS in the real world? Art Houle (Jul 15)
- RE: QoS/CoS in the real world? Stephen J. Wilcox (Jul 18)
- RE: QoS/CoS in the real world? Jeff Hancock (Jul 24)
- RE: QoS/CoS in the real world? Kurt Erik Lindqvist (Jul 25)
- RE: QoS/CoS in the real world? Jeff Hancock (Jul 25)