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Download to Upload Ratio

  • 29-10-2010 1:19pm
    #1
    Johnboy1951
    Registered Users, Registered Users 2 Posts: 14,048 ✭✭✭✭


    I only recently noticed what the ratio is here and wondered if it is similar for everyone.
    Nothing else running or accessing the internet, while downloading from
    http://ftp.heanet.ie/pub/
    a 700MB file using ADSL broadband it appears that I am uploading 1MB for every 30MB I download (approximate figures).
    Example
    250MB down
    8.4 MB up

    Approximately a 30:1 ratio of download to upload.

    Do others have similar ratios?

    Thanks.


Comments

  • #2
    pickarooney
    Moderators, Arts Moderators Posts: 35,731 Mod ✭✭✭✭pickarooney


    Is there a unix angle to this?


  • #3
    Johnboy1951
    Registered Users, Registered Users 2 Posts: 14,048 ✭✭✭✭Johnboy1951


    I guess as I only use Linux I graduate to such sections on boards ...... please move if inappropriate ....


  • #4
    FSL
    Registered Users, Registered Users 2 Posts: 1,456 ✭✭✭FSL


    When you are downloading the downloading server need to know you have received the packet and that it is not corrupt, If there is a problem then it will resend it. Consequently there will always be an upload element.

    Obviously the acknowledgement is shorter than the data being sent, hence the 30 to 1 ratio you are observing.


  • #5
    Johnboy1951
    Registered Users, Registered Users 2 Posts: 14,048 ✭✭✭✭Johnboy1951


    Thanks, and yes I am aware of the reason for the uploading.

    My question was whether the ratio I am observing is normal or common.

    **
    EDIT:

    Having done some tests and received some answers from other users in different locations, it appears the ratio I am seeing is normal.

    regards.


  • #6
    FruitLover
    Registered Users, Registered Users 2 Posts: 2,534 ✭✭✭FruitLover


    Sounds about right - a full TCP segment being passed over IP would typically be in the region of 1450 bytes (depends on what it passes through, but most internet routers would be set up for around this size), and a TCP acknowledgement segment is around 52 bytes. Divide the bigger by the smaller and you get close to a 30:1 ratio.


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