TBB tester often fails to keep up. Nothing new.

Just for curiosity, what do you get from this link (15MB test file), & how does it compare against your other speed tests?

http://www.btopenworld.com/speedtest

Paul.

Edited by deleted (Wed 21-Dec-11 11:44:36)

About 4.5s to download that, which is a bit too short for reliable bandwidth measurements I think. It works out around 28/29Mbps.

I agree, the file is realistically too small for FTTC speeds, but it's the only one I could find that appears to be specifically geared to testing throughput speeds.

If you know of any others, please shout out accordingly.

Well, using TBB's own download test files, on the 100MB file the throughput comes out at about 23Mbps, which is near 30% greater than their own test reports.

Different transfer protocol, you will be using HTTP for the file download and providers can handle different categories of traffic in different ways.

In the same way that people complain when RTSP (flash streaming) often can be slower than speedtest results.

Thanks for the clarification. What's your own take on these measured differences? I see your comment about the different measurement design philosophies and personally wouldn't bother if the difference was in the order of a few percent, but essentially TBB is reporting somewhere in the region of half the speed of most other speed test sites.

And does your ISP employ traffic management for P2P?

To really comment one needs to see a tbbmeter plot, with indication which is our test, and which is the other test. Or another usage graph tool if you want.

We have no Windows O/S in the household, alas, so cannot use TBBmeter. If you happen to think of a suitable Mac one, I'd be happy to give it a go.

As for traffic shaping/management, perhaps you experts can tell me whether my ISP, BT Infinity, employs stuff like that?

Not a recommendation, but what I could quickly find

http://www.skoobysoft.com/utilities/utilities.html - Surplus Meter