Networking and Quality of Service Robin Tasker, Daresbury Laboratory, 20 October 2000 In the UK,...
-
Upload
vincent-williams -
Category
Documents
-
view
212 -
download
0
Transcript of Networking and Quality of Service Robin Tasker, Daresbury Laboratory, 20 October 2000 In the UK,...
Networking and Quality of Service
Robin Tasker, Daresbury Laboratory, 20 October 2000
In the UK, based on a GRID networking workplan :-
definition and understanding of terms of QoS;
traffic management techniques;
diffserv;
bandwidth broker techniques and capabilities; and
GRID matchmaking
Development Process
Understanding :-theoretical basis of approach etc..
Laboratory testbed for techniques :-develop (or learn from others’) experience in well constrained environments
Wide area testing of techniques :-look for the issues, costs and benefits in the “real world”
Wide area deployment - if appropriate and possible
ESnet JANET
ns2.slac.stanford.edu
evagore.slac.stanford.edu
icfamon.dl.ac.uk
By defaultALL ESnet traffic marked “high” priority
into JANET via NY PoP
Traffic from evagore.slac.stanford.edumarked at “normal” priority into JANET
at the NY PoP
(CAR + WRED)
Low-level traffic management techniquesCongestion Avoidance - CAR and WRED
ESNetHigh Priority
CAR+WREDenabled
Config changes toCAR and WRED
Further configchanges
ESNetNormal Priority
CAR+WREDenabled
Config changes toCAR and WRED
Further configchanges
Abilene JANET
icfamon.dl.ac.uk
By defaultALL Abilene traffic marked “high” priority
into JANET via NY PoP
(CAR + WRED)
Just how relevant are such techniques?
CAR+WREDenabled
Config changes toCAR and WRED
Further configchanges
AbileneHigh Priority
Peeringbandwidth increased
Conclusions
Understanding of theoretical basis of approach is important
Laboratory testbed for techniques either to develop (or to learn from others’) experience in a well constrained environment is important
Wide area testing of techniques looking for the issues, the costs and the benefits in the “real world” is absolutely vital
QoS techniques may be exciting and interesting but do they give best return on investment to meet user requirements?