[Make-wifi-fast] NanoStation M5 anyone?

Toke Høiland-Jørgensen toke at toke.dk
Tue Jun 12 06:24:13 EDT 2018

Pete Heist <pete at heistp.net> writes:

> This is an appeal to anyone who has access to a NanoStation M5 and a little time to try to reproduce this problem and add to this post:
> https://community.ubnt.com/t5/airMAX-Installation/NanoStation-M5-ping-spikes-about-once-per-second-even-just-to/td-p/2358704
> I’ve been trying unsuccessfully to demonstrate to Ubiquiti that they
> have a bug somewhere that causes isochronous latency spikes. It seems
> what’s happening is that for a fixed period of time (20ms when one
> Ethernet port is in use and 40ms when two are in use), once per
> second, the device queues packets until the pause is over. The
> function ar7240sw_phy_poll_reset in ag71xx_ar7240.c exactly describes
> the behavior of 20ms delays when one port is connected and 40ms delays
> when two ports are connected, so basically it appears that the
> Ethernet / internal switch device is being reset once per second for
> some reason.
> So far nobody has seemed to care (after all, who’s counting 40ms here
> or there when it comes to WiFi?), but it does pollute my test results
> and may be causing latency spikes wherever these devices are deployed
> (like, worldwide). So if anyone else tests this and can add some
> weight to the discussion, I’d be glad. :)

Does this only happen with stock firmware? I think I have reflashed all
of mine...


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