Yeah, I noticed those interruptions or whatever is causing it as well. I am having a heck of a time with this link. I had my brother call spectrum today and verify that his modem is JUST a gateway.. else make sure it is in bridge mode. It is in fact just a gateway. It is a DOCSIS 3.1 modem with a 2.5gb port.. actually sync’d at 2.5 to the router. I forgot the router actually has a 2.5g port.
Anyhow, back on topic.. doing a test on it with no queue at all, it gets ~600 down and ~40 up. What really strikes me as odd is if I use fq_codel or cake, I can only get it to around ~350 tops. I can leave the downstream unlimited, and still never gets past 350. Really odd.
So, with that said, I had him plug his computer in straight to the modem to do a speed test. Granted, it is web based but upload is still ~40 and download is from 720-830 easily twice of what is going through the router.
CPU utilization never goes above 25% which now that I think about it, it is a quad core.. so that would mean it is stressing a single core. HMMM.. maybe that is the limiting factor?
Been following along and don’t have too much to add other than it’s been very interesting and informative to read this discussion!
Regarding your speed issue, I wonder if it’s this issue that was mentioned by another user in a different topic? They have a 5009 and a 2.5Gb modem as well it looks like: http://forum.mikrotik.com/t/rb5009-support/152371/1