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I thought of using download files to calculator the speed, but it turns out to be unsuccessful. Operation is as follows：

I download a file and read every second file size, and use a small tool observation network speed at the same time. Finally found that the size of the file every second increase less (300 KB/S), but the tools it show JVM download speeds up to 4M/S.

Now I do not have a few thoughts, and I need your help.

Maciej Ziarko
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Honest
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    Similar questions: http://stackoverflow.com/questions/6322767/measuring-download-speed-java http://stackoverflow.com/questions/3140101/java-how-to-get-upload-and-download-speed – Maciej Ziarko Nov 04 '12 at 06:43

1 Answers1

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When you are looking at the amount of actual data you are usually measuring in bytes (8 bits) and is without TCP/IP headers (can be 54 bytes). When you are looking at the raw connection you are measuring in bits and including headers. If the packets are fairly small (ie with a significant header overhead), you can have a 4 Mb/s (b for bit) connection and only 300 kB (B for byte or octet) of actual data.

Peter Lawrey
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