> On 19 Jul, 2016, at 07:29, Loganaden Velvindron <logana...@gmail.com> wrote: > > I've been playing with fq_codel on 3g internet connection. the 3g > internet box has no bridge mode, and just forwards every packet to the > Openwrt router. > > Here are the results without: > http://www.dslreports.com/speedtest/4470186 > > And here is the result with fq_codel on and 300 ms target latency: > > http://www.dslreports.com/speedtest/4470286 > > Is there anything that could be done to get the rating up to A+ by > tweaking the code ?
You say fq_codel, rather than Cake. Presumably it is paired with some sort of shaper, such as HTB? This is important, because I think the shaper is influencing part of your results. On downstream, you have one high latency sample (750ms) in the middle of a series of reasonable ones (250ms). This implies a momentary glitch in your connection, which isn’t unusual with wireless links. Re-measuring might eliminate it. On upstream, you have two very high latency samples at the *beginning* of the run, which then clear out to approximately the baseline latency. This is a classic sign that your shaper is letting a burst of traffic through before actually starting to control it, which is typical behaviour for token-bucket shapers. That initial burst collects in the dumb queue of your 3G modem and takes time to drain away. Cake uses a shaper carefully designed to *not* burst in that manner, while still maintaining full throughput regardless of timer resolution and latency. Using Cake instead of fq_codel+HTB will therefore probably improve your upload characteristics. - Jonathan Morton _______________________________________________ Cake mailing list Cake@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/cake
