You did not indicate "where" your download speed is being shown/
calculated, nor the time
granularity used. Quite often the speed spike are not really spikes
(especially when first
starting the download) because of the way the download speed is being
calculated and
as time goes on the download speed stays constant, or it will drop off
then stay constant.
Think of it this way (note the figures are just approximates as
illustration only with rounding)...
1) download requested from server
2) first bit of data arrives; calculated speed is roughly amount of
data / 1 ms. (smallest granularity)
= very high speed (1000 times amount of data)
(example - first chunk is 1400 Byte, this would give approx
1,400,000 Byte/sec rate)
3) next bit of data arrives; calculated speed is roughly total amount
of data / (time from first bit
to second bit) = lower speed (unless the server is close enough
that you have < 1ms time)
(example - second chunk 1400 Byte arrives 100 ms later which would
give approx
2800 Byte for 100 ms. = 28,000 Byte/sec).
4) next bit of data arrives (example 1400 Byte 100 ms later which
calculates out to
4200 Byte in 200 ms. = 21,000 Byte/sec).
and so on... get the picture (it all depends upon how the calculations
are done)?
Notice how the rate is dropping off when in actual fact in this
example it is actually 14,000 Byte/sec.
On Feb 22, 7:37 pm, Coalwater <[email protected]> wrote:
> Well i noticed that i when ever i start a download, the download speed
> starts with a very high speed spike in the beginning that could reach
> up to 3x of my bandwidth, and last for like 3 to 10 secs then starts
> to gradually drop till it reaches my usual expected download speed,
> this isn't really a problem but i would really like to understand it
> from the networks point of view, how does it get past the ISP limit
> even if for a very short period of time, because i might think of
> using it to my advantage somehow if i understand it, Hope some
> networks guy around here could explain to me :D
> oh and it doesn't depend on the connection type nor the operating
> system, i saw this happen on cable connection and mobile broadband,
> windows and ubuntu so it doesn't have any thing to do with those
> differences.. oh and it works also with both normal single connection
> download and download accelerators that use multipart downloading
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