Computer-network TCP-congestion-control

Question

How is the initial slow-start threshold value (ssthresh) determined for the very first time of data transfer?

Comments

@arjun

@gate-keeda

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it is 1/2 of the window size given.

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take an idea from this question
https://gateoverflow.in/76084/made-easy-test-series-2016-tcp-congestion-control

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@uddipto

Could you provide/refer some good material regarding this?

Please help.

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i always prefer foruzan /kureose ross book

and NPTEL video lecture is also good

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If it is not mentioned in the question then no need to calculate threshold window size at the begining but need to calculate threshold when first timeout occur or packet is lost.

Answer 1

First we have to take min[ W(C),W(R) ] where W(C)= capacity of network and W(R)= receiver window size.

Then Threshold will be 1/2(min of these two).

Now let sender window size=16 and Threshold turn out to be 8.

1,2,4,8,9,10,11,12,13,14,15,16,16,16,16,16.....

Answer 2

it is decidec by the minmum of current congestion window of network and receiver window size