sourcejedi

A little bird told me testmy.net has been revised :-).  Same great taste, but still no bufferbloat test.  Search didn't find an entry in this forum, so here's your feature request :-).
 
High download & upload speeds are nice.  But particularly on slow connections, it's very easy to have your connection degrade horribly when you have something uploading.  BitTorrent was the historical example, but other examples might be DropBox sync, or uploading photos to Facebook.  If your modem buffers are bloated, latency during uploads can increase e.g. from 0.05 seconds to 1 second.  That's a factor of 20, e.g. it can cause web pages to take much much longer to load.
 
Feature request: detect if there is a large increase in latency during the upload or download test.
 
Thanks
Alan

Based on my experience using the Ookla Speedtest mobile app, the Android app can't be trusted!
 
Have a look at the following two tests run on my mobile (OnePlus One):
 

 
The following is the router's DSL status page which I ran both tests with:
 

 
Notice the overinflated uplink result in the Speedtest app result vs. my DSL line speed.
 
On my fixed wireless ISP connection, it underrates the downlink:
 

 
As I don't have access to a status page showing what my Wireless ISP is limited at, I ran an FTP test right after the following tests completed:
 

 
3.4MB = 27.2Mbps, so it's obvious which result is more accurate.
 
These are the results form a YouTube video I created showing these tests in action.  Usually the Speedtest.net app reports about 50% above my actual uplink for any connection, but in this case it was out by over 3 times the link speed!  Plus catching it in a screen recording made was even more exciting as I think I only ever seen it go that high once before.
 

I love testmy.net .  I'm curious if you're aware of the "ping under load" issue, as shown in the dlsreports.com speedtest results?  A.k.a. bufferbloat.
 
There's a lot of old DSL connections set up with excessive buffers.  When you're actually using the connection, ping goes from reasonable to several hundred ms, and it just sucks to use.  I've seen both >1000ms during uploads and  >1000ms during downloads.  And that's cumulative (i.e. if you do both at once).
 
Faster connections tend not to have a problem, but there's still plenty of bad connections around.  E.g. see /speedtest/results/bufferbloat on the same site.