[lkml]   [2010]   [Jul]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    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?


    Ed W

     \ /
      Last update: 2010-07-14 12:53    [W:0.018 / U:1.036 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site