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SubjectRaise initial congestion window size / speedup slow start?
Hi, my network connection looks like 500Kbits with a round trip latency 
of perhaps 1s+ (it's a satellite link).

From what I can see the linux initial congestion window is signficantly
limiting me here, with slow start taking many many seconds to open up
the window wide enough to get the data flowing? For protocols like http
this is really hurting with all the short lived connections never really
getting up to speed. (throw in some random packet loss and things
really screech to a halt)

Reading around there appear to be several previous attempts to modify
the kernel to start with a slightly wider initial congestion window, say
10 packets. (Seems even google did some work on this and agreed that a
small of initial cwd to 10 ish, would help even many non satellite
users?) However, all the work I can find is quite old and doesn't seem
to give me much of a leg up in terms of experimenting with such changes
on a modern kernel?

Does someone have some pointers on where to look to modify initial
congestion window please?


Thanks

Ed W


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