From: Brian S turner (brian@xxxxxxxxxxxxxxxxx)
Date: Fri Jul 21 2000 - 17:36:26 GMT-3
I guess I will answer my own question, and since there was
some interest in the results here you GO!!
Well I spent a good portion of the morning with a sniffer,
and found out what it was the Apple/Mac by default uses a
TCP window size of 32768. And all Microsoft products use
a Default TCP window size of 8760. Also It seems that Macs
generally open 2-4 tcp connections for the download. Each
connection only downloads 1/4th of the file so you can ack 4
times the amount of data. I spent some time with the technet
cd and found the regestry entry for the window size, and
changed it on my machine.
Here is the registry entry you have to create:
hkeylocalmachine/system/currentcontrolset/services/vxd/mstcp
create a sting value and name it
DefaultRcvWindow
set its value to
32768
or if you could play with the value by making it
higher the max is 65536 or something like that (it is a 16bit field)
I tried several different settings, and 32768 seems to be the
fastest for me. You may find that over a modem even 32k is too
high.
As far as opening multiple download sessions at once, there
is a program called Download Accelerator that performs the
same function, I have decided that I don't need this program.
http://www.downloadaccelerator.com/
It might make you download a little faster, because it jumps your
speed immediately up to full speed, unlike normal where it slowely
ramps up to full speed. This is because 4 connections speed up 4
times as fast. The speedup is attributed to the server you are
pulling data from assumes you have a 56k connection, and starts
tunnings its download speed to your actual connection speed when
it sees that you are able to accept more data, this helps the server
itself share the bandwidth equally with all the users it has
connected to it.
Happy Surfing/Downloading!
Brian Turner
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Brian S turner
Sent: Friday, July 21, 2000 8:25 AM
To: ccielab@groupstudy.com
Subject: Apple Question
Ok this is not lab related but it is driving me crazy.
I have 2 or 3 mac's laying around and 2-3 PC's laying around,
when I download a file or browse etc. Using the same Internet
connection, and the same ethernet and same browser version
etc, the Macs always get 2 times the throughput of the PC's
I am talking some AMD 700 pc's vs 333 mghz macs in some
cases, but all the PC's get roughly the same say 65k per sec
and the macs get 120k per sec. Anyone have any idea why?
Brian
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