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  1. #1
    Join Date
    Mar 2008

    * doubt with bandwidth calculations

    I had got now a new doubt with how the bandwidth is calculated,

    I assumed so far that,

    if a file of 1 mb is download 1 time, the bandwidth consumed is 1mb and if its downloaded 10 times then the consumption is 10mb,

    recently I went through some article and it totally confused me and now I have doubt if my way of bandwidth calculation is correct or not, if not then what's the correct procedure

  2. #2
    Join Date
    Jun 2003
    London, UK
    Technically what you're describing is data transfer rather than bandwidth. Bandwidth is a measure of the amount of data transferred per second, for example '1mbit/s'.
    Darren Lingham - UK Webhosting Ltd. - (0800) 024 2931 - Quality UK Windows and Linux hosting since 2003
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  3. #3
    Join Date
    Mar 2004
    Your calculation will be roughly right for a small number of downloads. But it's not so simple. Assuming a packet size of 1500 bytes (which is the norm for an ethernet network), a 10 MB file is 10485760 bytes. So dividing that by 1500 gives 6990. So transmitting that file ads an additional 6990 packet headers.

    Now I'm not sure of the size of a packet header, but they are small, also, if you want to take upload bandwidth into account then you need to allow for the ACK packets of TCP. So I'd just allow a 10 byte overhead per packet as a rough guide, which gives roughly a 68Kb overhead to each 10 MB file.

    In addition, if the file is being sent by email, you will need to allow for the encoding so allow another 50%. If being sent via FTP, you need to allow for the overhead of the control connection used to send FTP commands and for the initial TCP handshake. So I'd allow 70k overhead per file downloaded as a rough estimate.

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