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Network World - The question of whether you're getting the bandwidth you pay for is one that just doesn't go away. Twice in the last few months I've suspected my ADSL connection of running slow and, sure enough, despite the modem telling me I had 3Mbps down and 500Kbps up, for whatever reason, restarting the modem fixed the problem.
I personally blame AT&T for not cleaning the bits as they route them to me and because of that my modem is getting a build-up of digital residue.
Ookla's Flash-based app figures out where on the 'Net you are, which of their test servers are nearest you based on ping time, and then uploads and downloads large files to measure throughput accompanied by cute graphics (which shows what looks remarkably like a man peeing on a pyramid ... but I digress).
As you can see from the screenshot, my download and upload performance figures are roughly in the expected ranges, though the scorecard (see image) rather depressingly tells me my connection gets a rating of D-minus and is slower than 77% of other U.S. connections.
Speedtest.net also has a free iPhone app (which is iPad compatible) that does much the same thing but obviously not using Flash (in case you're not aware, Apple doesn't allow Flash to run on iOS for a number of good reasons, including stability and security issues as well as the fact that Steve Jobs loathed Flash).
The iOS version of Speedtest.net looks much slicker than the Web-based version and, unlike the Web-based version, you can choose which test server to use. Curiously, the app consistently gives slightly lower throughput values which is, I suspect, due to performance issues with bulk data transfers over Wi-Fi (the interface also has an "easter egg" ... "pull down" on the meter when not running a test to see a demonic-looking kitty).
The few reviews of this app complain that it isn't accurate, but I found it to be in reasonable agreement with its online sibling.
Another connection performance test app I like for its presentation is Speedtest X HD (there's a free version and a Pro version for $0.99) published by Veeapps, which also appears to yield similar results to the other tools already covered.
With Speedtest X HD you can select which server to use (a few of them are only available with the Pro version) and it provides an interesting display of global performance stats. You can also add your server, though what's involved in this is not explained in the app or on their site which is, as of this writing, broken. This makes me hesitant to recommend the paid version.
Of course you have to be careful of casting aspersions on your ISP's service when using these tools as they will only give accurate results if your connection isn't being used by any other applications or services. This is where cloud services can fool you as many run in the background and, while they may adapt to changing bandwidth usage by throttling themselves, they'll still make your connection look slower than it actually is.
A few weeks ago I wrote about AppNeta and their multi-site WAN and LAN performance management suite and how they used a fascinating technique called Packet Dispersion Analysis to test and characterize network connections.
To refresh you: Packet Dispersion Analysis sends a sequence of small packets of varying sizes and configurations to a test server and back again. By analyzing how these packets are delayed and routed by the network it's possible to determine the latency, the available bandwidth (or "headroom"), the actual bandwidth used, and how well certain protocols (such as VoIP) perform.
The beauty of this technique is that Packet Dispersion Analysis requires only a tiny fraction of the available bandwidth to work (with AppNeta this is only 20 small packets) so it can be run while routine network operations are in progress without causing any noticeable bandwidth impact.