dropping speeds

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bravoboy
Member
Posts: 28
Joined: Mon Apr 15, 2002 7:38 pm
Location: usa

dropping speeds

Post by bravoboy »

i use roadrunner cable. i have a rca modem.

use win me

i used the sg optim tool with the cable and optimum preference. and i also used the speed and web browse patch.


but wen i download a file like 50 megz (this was a test i did) i started off with like 500 kb/s then it dropped dramatically to 300 kb/s then slowly dragged to 200 kb/s and kept dropping like 1 kb every now and then.


any suggestions? thnx
Kip Patterson
Senior Member
Posts: 4438
Joined: Wed Jun 07, 2000 12:00 pm
Location: Columbus, Ohio

Post by Kip Patterson »

Two things are happening:

1) The cap on cable modems is normally configured to allow a surge at the start of a transfer. It's called a "leaky bucket" You are allocated a bucket which holds perhaps 4 megabits. It is refilled at 2 megabits a second, and depleted at whatever your download rate is. Unused download can accumulate, but only until the bucket is full.

2) Your download program is reporting on the internal transfer from the TCP/IP buffers to disk. When you open a connection, data is transferred until the RWIN buffer is full, while you are at the keyboard telling the system where to put the DL. When you press enter, the accumulated data is transferred as fast as your computer bus will move it.

Kip
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