As a side note, you can do direct comparisons between data sets in flent, really easily.
Load up all the data files in it, select something less noisy as a plot type (cdf, totals, or box totals), then select Data->Add other open data files. I am *ALWAYS* a fan of looking at the default, detailed graph (all or all_scaled)first, to see if there was any weirdnesses that would be missed by the other plot types. As an example of weirdnesses you can only detect by looking at a string of test's long term behavior, see the current thread and pictures on: https://plus.google.com/u/0/107942175615993706558/posts/WA915Pt4SRN One of the things I was concerned about going from 4.1 to 4.4 is that there was a lot of x86_64 based optimization of the routing cache... and I was certainly concerned about adding more variables to the fq_codel algorithm, also. I saw pretty bad register usage in cake on arm when I last looked, I've kind of always wanted people to try -O2 instead of -Os. On Mon, May 16, 2016 at 1:48 AM, Hannu Nyman <hannu.ny...@iki.fi> wrote: > I already said to Felix yesterday that I felt that with kernel 4.4 my ar71xx > WNDR3800 seemed somehow more sluggish. Now I tested the matter with "flent". > > And sadly, with kernel 4.4 my router's performance decreases significantly. > With kernel 4.1 the router achieves about 20% higher download throughput > than with the 4.4 build :-( > > I used "flent" to measure wired connection throughput with > - two LEDE builds: r241 with kernel 4.1 and r253 with kernel 4.4 > - two separate speed limits for SQM simple fq_codel QoS: 85000/10000 kb/s > that should leave some CPU power free in the router, and 110000/15000 that > should fully utilise the router's CPU. > - otherwise identical settings, all measurements made inside 30 minutes so > no changes in traffic conditions > > The achieved speeds were: > > r241 kernel 4.1 - 85/10: 79 Mb/s down, 8.1 Mb/s up > r253 kernel 4.4 - 85/10: 67 Mb/s down, 8.5 Mb/s up > > r241 kernel 4.1 - 110/15: 85 down, 10.5 up > r253 kernel 4.4 - 110/15: 70 down, 10.8 up > > (ping latency stays at 16-17 ms with all four tries) > > With both SQM speed limits, the kernel 4.1 build performs significantly > better. > > This performance decrease might be due to the kernel version bump to 4.4 or > the qdisc/codel changes made to the 4.4 patches a few days earlier. > > This chart sums it up: > https://www.dropbox.com/sh/89pntkzjxydnn4c/AAC4x9cScJERL9Wfxm4k43kma?dl=0&preview=Kernel41_44_comparison.png > > Full flent data (summary pics & rrul data files) for all four tries is > available in: > https://www.dropbox.com/sh/89pntkzjxydnn4c/AAC4x9cScJERL9Wfxm4k43kma?dl=0 > > > > _______________________________________________ > Lede-dev mailing list > Lede-dev@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/lede-dev -- Dave Täht Let's go make home routers and wifi faster! With better software! http://blog.cerowrt.org _______________________________________________ Lede-dev mailing list Lede-dev@lists.infradead.org http://lists.infradead.org/mailman/listinfo/lede-dev
