Very nice explanation. Thanks for that. On 3/1/10, Mohammad AbuShady <[email protected]> wrote: > 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. > >
-- Anvesh Saxena -- 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.
