a { w townies 't " . dropped s . !?%Aks , Out of order Dup - - PDF document

SLIDE 1

OCT 6,2020

:

TCP continued

• Cong

. Avoidance . ^ Linear increase

2.

gang

. Avidan

• poison

'm isms"c%" Yam:{⇒ phase . CW =..________- ' f

SSThre%

• I
• Now

, say AB comes to Tx .

• Tx

moves Cw to : [14 .

• .

23 ] I sin: " a

¥tp

. I increase 1 ' f l l l l l l l l l l l l l H ' l l ' 'l lill l l l ' I 111 / J time Packet Drop (in RTT) Tx Rx wp a{ "" d

w

" .

÷÷

townies't

s.!?%A÷ks

dropped

, Dup ACK

⇒

Out of order

reception

. CW

• lo
• Pu - Pao

↳

SSThreshold =

Chyz [11,20]←

Rx can

• ptimize

CW = I cw= il Acks by [ n ,z←

.im#saqq;ngmcw--

13

TAB

every K

[14,26]

packets .

#

K often

• 2 .

SLIDE 2 Tx Rx 1 Egg Dupacks

• CW
• IO
• [ 11,20)

Tx CpfAu Rx

¥4

.

¥::÷.'¥tF

• iii. asia :÷÷÷÷÷:H¥..#⇒

Cw-

• 5.zig

. . Is

• 646

New

• [a. 26

]

/

/ w

• if

[E.It

SST = (7/2)=3 [5] DupACK ⇒ Out of order (ooo) pkt received by Rx Rx says let's wait a watch → no need to panic yet . He

Triggers

"

fast recovery phase

"

H

SS Threshold =

Any 2

Cw

= Cw -13

H

CW = 4-13=7

[5

6

78

9

10 11]

• 2

new pkts transmitted .

SLIDE 3

¥

i . Ps

#x

TE

e:÷¥¥¥i÷÷:f÷÷

:#

AM

• ¥

¥÷÷¥¥i÷÷÷÷÷÷÷÷

:

→

Fastkecovery.CZ#Ck)f-jkgseatwassoio--w7'

'

ants

!7q÷2:*

↳

keep

dining:[ in every new

• ne

↳

• nce

new Ack , treat as

[40,639

µs

"

'

im

:÷s÷c:S:*

CW " t

• 12
• 140,403

SLIDE 4

Ti

• 2. Be

e::

q.i://.io

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.

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• AS