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iis ftp : Transfer Speeds seem slow


Nathan D.
3/21/2005 2:27:04 PM
I am currently running MSFTP on a 2003 Server box. My ISP has assured me that
my upload speed is 384k/sec yet when I am outside my network trying to pull
something off the FTP, I can only reach speeds in the area of 30k/sec. Are
Nathan D.
3/21/2005 4:03:04 PM
That was something that never crossed my mind, so I checked my speed at
http://speed.fastaccess.com/ which rated my upload at 369Kbps.
So I guess I'm still stuck.


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Alun Jones [MSFT]
3/22/2005 7:39:01 AM
Note that 369Kbps, with a small "b", means 369 kilo_bits_ per second.

Since there may be as many as ten bits to the byte, that means anywhere from
37 - 46 KBps - kilo_bytes_ per second.

Add in IP and TCP framing and headers, and if the speed you are getting is
reported as 30 KB per second - 30 kilobytes per second - you are pretty
close to full speed.

If, on the other hand, you are getting 30 kilobits per second - closer to
three kilobytes per second - then you have something that needs addressing.

Alun.
~~~~
--
Software Design Engineer, Internet Information Server (FTP)
This posting is provided "AS IS" with no warranties, and confers no rights.

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Nathan D.
3/22/2005 9:07:02 AM
What would that something be that needs addressing? Because when I ran that
test yesterday, that was while I had an upload going at the 30K, which to me
implies that I would add the 30K on top of the 369Kbps. Or am I way of base?



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Jason Brown [MSFT]
3/22/2005 10:35:20 AM
just a guess here, but is your ISP talking kilobits while you're talking
kilobytes? Just a slightly off-the-wall suggestion, but you never know -
I've personally been in mix-ups over this



--
Jason Brown
Microsoft GTSC, IIS

This posting is provided "AS IS" with no warranties, and confers no rights.

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Alun Jones [MSFT]
3/22/2005 1:22:42 PM
You're skipping over answering the main thrust of the argument here, and
that's whether one K is the same as the other K.

You need to check very carefully to find out what units you are talking in,
so that you can see whether or not the one number compares favourably or not
with the other.

And since the speed test page is provided by your DSL provider, that
suggests that any speed measurement is a measure of the raw speed of the
line, whether or not you're sending data along it (try a simple experiment -
measure once with a data transfer designed to take up maximum bandwidth, and
then a second time without such a transfer, to see if the results are
significantly different.

Alun.
~~~~
--
Software Design Engineer, Internet Information Server (FTP)
This posting is provided "AS IS" with no warranties, and confers no rights.

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Fritz
3/23/2005 3:35:57 PM
Just read Alun's responses!
Line speeds are measured in Kilobits (Kb), when your FTP client reports
download/upload rates they're usually in KiloBytes (KB).
384 Kilobits = roughly 46 KiloBytes. No network connection is ever 100%
efficient. 30KB rate sounds reasonable on a 384Kb line.

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