I never said "an application can set the window size"

But the OP asked: "how can i change the tcp parameters (i.e. tcp window size, scaling"; and the answer is: he cannot.

The application can influence this

Great. You've outlined a mechanism for potentially effecting some indeterminate change in the window size/scale factor product. Now show how to do something useful with it.

The primary benefit of adjusting those (that) parameter is to improve throughput by tailoring the effective buffer size to the bandwidth and latency of the link.

To make the adjustment, you need to know:

But, none of these factors are available to application code. Not only is that information not available from the stack; even if it was, it would do you no good because the only parameter you can tune is the retrieve buffer size; and that has to be done before the connection is made; so you cannot even try to instrument these from within the application and adjust in light of your findings.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
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In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^8: changing tcp parameters when establishing connection by BrowserUk
in thread changing tcp parameters when establishing connection by iThunder

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