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ComposingSDNControllerEnhancementswithMozart
ZhenyuZhou TheophilusBenson
GoogleRunsSDNs@Scale
Shhhh…..
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Controller
App App
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01 BackgroundSDNApps’Assump>ons
02 MozartDesignAbstrac>onsandInterfaces
03 Evalua>onPerformanceand
Overhead
CONTENTS
WhatareSDNs?
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Network
Controller
App App
SDNApps
Rule2Rule1
CaseStudy:Hedera• Improvingdatacenterperformancebyloadbalancingelephantflows
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Gathernetworkstate
Configurenewpaths
Controller
App App
Rule2Rule1
MergedRule
WhatareSDNs?
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Network
Controller
App App
SDNApps
Rule2Rule1
MergedRule
SDNEnhancements
Functionality
Optimization
SDNApps’Assump>ons&SDNEnhancements
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Rule2Rule1
MergedRule
TCAM-Op>mizer ConsistentUpdate
InstantaneousUpdates
InfiniteHardwareResources
UnmodifiedAc>ons
SDN-Enhancements
SDNApps’Assump6ons
FaultTolerancePath
ControllerApp App
ControllerApp App
Moreresultscanbefoundinthepaper
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Controller
App App
MergedRule
SDNEnhancementsOptimization
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Rule2Rule1
MergedRule
CaseStudy:Hedera
RelatedWorks
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App1 App3App2
Composer
Pyre>c[NSDI’13]
IgnoresSDNEnhancements
App
NovelInterface
Athens[CoNEXT’14],Chopin[CoNEXT’18]
RequiresunderstandingallSDNEnhancements
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Whatabstrac?onsarerequiredtosystema?callyincludeSDNEnhancementsintotheSDNecosystem?
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02 MozartDesignAbstrac>onsandInterfaces
03 Evalua>onPerformanceand
Overhead
CONTENTS
01 BackgroundSDNApps’Assump>ons
AnotherStory:CompilerOp>miza>on
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-fgcse-ader-reload-fipa-cp-clone-floop-interchange-floop-unroll-and-jam-fpeel-loops…
Image referenced from: https://www.cs.cmu.edu/afs/cs/academic/class/15745-s02/www/lectures/lect1.pdf
Transac6on
Mozart
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Compiler
SDN
-fgcse-ader-reload…
Mozart SDNNetwork
{IO}{AD}{LS}{PF}
App1
App3
App2 Rule2Rule1
SDN-Flags
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Rule2
Rule1MergedRule
App Transac>on
TransacAon
Message1Flag1Message2Flag2……
GlobalFlag{IO}
Op>miza>on
Checker
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Match2Ac?on2
Match1Ac?on1
Match AcAon
Order
SDN-Flags
LocaAon
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Match2Ac?on2
Match1Ac?on1
Match AcAon
Order
SDN-Flags
LocaAon
Rule2
Rule1 MergedRule{IO} Rule
MatchAc>onAc>on1…...
{AD}
Rule{LS}Rule{PF}
Match1Ac>on1Match2Ac>on2
…...
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02 MozartDesignAbstrac>onsandInterfaces
03 Evalua>onPerformanceand
Overhead
CONTENTS
01 BackgroundSDNApps’Assump>ons
Evalua>on• Data-Plane• Control-Plane
• Workloads
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FatTreeMininet
Realis>cDCN Synthe>cBest-RandomWorst-Stride
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Rule2Rule1
MergedRule
CanMozartimproveperformance?
What’stheoverheadofMozart?
ControllerApp App
What’sMozart’sbenefitforbackwardcompa>bility?
App
HowmuchworkdoesMozartintroduceforSDNAppupdates?
Moreresultscanbefoundinthepaper
Evalua>on
Proac>veSDNApp(Hedera)• Saves24.8%reduc>oninaggregatebandwidthintroducedbyTCAMOp>mizer.
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Evalua>on
Moreresultscanbefoundinthepaper
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MozartOverhead• Sublinear• 1.58%tolatency
Evalua>on
Moreresultscanbefoundinthepaper
• SDNcontrollersareill-equippedwithpoorprimi>vesforsuppor>ngSDNAppsandabstrac>onsforenablingSDNEnhancements.• Mozartinterfaceallowsforasystema>candprincipledinclusionofSDNEnhancementsintotheSDNecosystem.
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Conclusion
ThanksforyouraMen?ons!
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