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upload overhead (torrents etc.)

  • 17-02-2011 9:08pm
    #1
    pickarooney
    Moderators, Arts Moderators Posts: 35,731 Mod ✭✭✭✭


    I don't know if this is a linux question as such or more a general network thing, but here goes anyway.

    I have a fairly low upload speed on my home connection and as such have limited uploading to 10 kB/s on ktorrent. However, when I'm downloading/sharing ubuntu ISO files, even though the total upload speed in the ktorrent interface is displaying as <>10kB/s the toal upload bandwith used by the program is 25-35kB/sec consistently, according to nethogs and a network monitoring widget I have.

    Any ideas?


Comments

  • #2
    Khannie
    Registered Users, Registered Users 2 Posts: 37,485 ✭✭✭✭Khannie


    Downloading has an upload cost too. That's the nature of TCP (it transmits back acknowledgements of packets received and other good stuff). If you completely disable the torrent app and kick off a download you will see that there is still some upload traffic.

    I'm guessing, but I'd say downloading comes with a ~2% upload cost.


  • #3
    pickarooney
    Moderators, Arts Moderators Posts: 35,731 Mod ✭✭✭✭pickarooney


    Khannie wrote: »
    Downloading has an upload cost too. That's the nature of TCP (it transmits back acknowledgements of packets received and other good stuff). If you completely disable the torrent app and kick off a download you will see that there is still some upload traffic.

    I'm guessing, but I'd say downloading comes with a ~2% upload cost.

    That 2% is very close to what I get when downloading via HTTP - 382kB/sec down 'costs' 8k up. Ktorrent uses significantly more upward bandwidth percentage wise but OSI's probably right in that peer connection is using the rest. I guess I just need to throttle my download speed a little to compensate.


  • #4
    Daegerty
    Closed Accounts Posts: 1,864 ✭✭✭Daegerty


    The cost varies a bit too with TCP windowing, maybe look into custom TCP settings. although I think some can only be changed in the kernel at compile-time


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