Table of Contents
Networking - Buffer Bloat
See http://www.dslreports.com/speedtest
Ideally you want to see A to A+'s for bufferbloat.
Test result showing a letter grade worse than a B, probably indicate you have bufferbloat.
That means the device at your bottleneck link (most likely your router) is letting bulk traffic (uploads/downloads) interfere with (and slow down) your time-sensitive traffic (gaming, Skype, Facetime, etc.)
If not then tune.
Test for Bufferbloat
The DSL Reports Speed Test makes accurate measurements of the download and upload speeds along with the latency during the test.
1. Start a ping to google.com. You’ll see a series of lines, one per ping, typically with times in the 20-100 msec range.
2. Run a speed test simultaneously. To do this, start one of the speed test services below:
- http://fast.com - (fast.com now tests for latency under load but we’d like more folk to check their results against our quick test)
3. Watch the ping times while the speed test is running. If the times jump up when uploading or downloading, then your router is probably bloated.
Things To Do To Prevent Buffer Bloat
- Change the Q size.
References
https://www.youtube.com/watch?v=o8nL81DzTlU&t=380
http://www.dslreports.com/speedtest
https://community.flexradio.com/flexradio/topics/pfsense-router-tuning-v2-4-4
https://www.bufferbloat.net/projects/bloat/wiki/Tests_for_Bufferbloat/
https://forum.netgate.com/topic/112527/playing-with-fq_codel-in-2-4/815
https://forum.netgate.com/topic/112527/playing-with-fq_codel-in-2-4/856
https://forum.netgate.com/topic/112527/playing-with-fq_codel-in-2-4