Bandwidth speed test

Posted on 2001-07-31
Last Modified: 2008-02-26
Does anyone have an accurate way to test upstream speed of a circuit??? (DSL and T-1 to ISP)
I have tried a few sites
But get a wide range of test results.
I need an accurate measure for sending live video.
Question by:superdome
LVL 17

Expert Comment

ID: 6341298
Ping is the most reliable command I've ever used to determine speed. Use it's parameters to increase or decrease packet size to help with correlating some good information.
LVL 16

Expert Comment

ID: 6341465
Do you mean: determine the true clock rate of the line? or determine a data transfer rate?


Expert Comment

ID: 6342602

Author Comment

ID: 6342799
Data trans rate
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Expert Comment

ID: 6346912

but this wil only tell you how fast your computer is connecting to their server... pretty accurate though......

BTW what do you consider wide range?  i've seen anywhere between 50-100 kbps difference before and that seems to be the norm  (in a span of about 2 hours..)

Expert Comment

ID: 6347961
hi try and use image option it is quit ok.

all the best

Expert Comment

ID: 6369024
You might try They also can test your setup and give recommendations of what to change in the registry.
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Accepted Solution

SteveJ earned 100 total points
ID: 6369171
For what it's worth: Unless you have ATM circuits set for constant bit rate OR unless you have dedicated circuits - no other traffic - you will be best served for video by having very large buffers at the receiving end. Without knowing your network better it's impossible to say why you get wide ranging results when you try different speed tests because the only result you can ever expect from a speed test is the data transfer rate you would have gotten at that moment if you'd been transferring data instead of screwing around with bandwidth speed tests.

You should: Calculate the theoretical payload transfer rate (clock rate of the line minus all protocol overhead for a given period). Calculate your "closer to real" data rate by factoring in your environmental variables like MTU, and MSS, observed ping RTT, and send and receive buffer size . . . assuming some sort of TCP application.

If after calculating the "closer to real" data rate you find that there is a substantial difference between the results of your calculations and your observed data transfer rate then something is misconfigured or misbehaving somewhere.

In other words, I trust my own configuration and mathematical ability. I use a "bandwidth speed test" usually defined as "unpredictable user variable tolerance to perceived sluggishness" to determine whether or not something's broke.

Good luck.

Expert Comment

ID: 6376076
I have rejected the proposed answer, so the question may return to Active status.

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