I see, thanks a lot, and for your question about where the speed is being show, it's both in the download window (firefox download window) and also a network speed monitor over the whole system, of course they don't show the same numbers but they both show the small increase in the start, and I don't really know what 'granularity' means.
~Coalwater~ On Mon, Mar 1, 2010 at 1:33 AM, KwikOne <[email protected]> wrote: > 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 > > -- > You received this message because you are subscribed to the Google Groups > "Computer Tech Support" group. > To post to this group, send email to > [email protected]. > To unsubscribe from this group, send email to > [email protected]<computer-tech-support%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/computer-tech-support?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Computer Tech Support" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/computer-tech-support?hl=en.
