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controleCongestion

controleCongestion - cwnd d’un MSS ± chaque RTT ³ Mise...

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TCP : contr°le de congestion Martin Heusse 12 dØcembre 2006 Foil T E X
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1 Motivations ° Ne pas saturer le rØcepteur (champs window ) ° Ne pas Ømettre plus de paquets que le rØseau ne peut en transporter Contr±le de congestion (fenOEtre de congestion ² l’Ømetteur) le nombre de segments non acquittØs est au plus le minimum de ces deux fenOEtres ° Arriver de prØfØrence ² un partage Øquitable des ressources Foil T E X
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2 DØmarrage ° Slow start : en rØalitØ, montØe exponentielle ° ³ chaque RTT, doublement de la fenOEtre de congestion ( cwnd ) ´volution de la la fenOEtre de congestion (en nombre de MSS) : 1 2 3 4 5 6 7 8 Foil T E X
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3 Congestion avoidance (TCP Tahoe) ° On ne peut pas augmenter la taille de la fenOEtre exponentiellement ² l’inµni ! ° Quand la fenOEtre de congestion dØpasse un seuil twnd : ¶ On cherche ² augmenter la
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Unformatted text preview: cwnd d’un MSS ± chaque RTT ³ Mise en ´uvre : ± chaque rØception d’un acquittement on met ± jour la fenŒtre de congestion cwnd ← cwnd + MSS × MSS cwnd ³ Comme on Ømet cwnd/MSS paquets par RTT, on augmente approx. de MSS tous les RTT. & En cas de perte (rØception d’un acquittement dupliquØ), cwnd ← MSS Foil T E X 4 & twnd : seuil de transition slow start → congestion avoidance & twnd initial : 65535 (Øgalement valeur max : valeur max champs window . . .) & twnd ← cwnd si twnd < cwnd & Sur perte : twnd ← twnd 2 Foil T E X 5 &volutions de TCP & RENO, new RENO, VEGAS & Reprise plus rapide aprLs une perte ( Fast recovery ) & Changement du calcul de l’estimation du RTT, de twnd Foil T E X...
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