Active fan, cpu and some more

Hi.

Ok, I got a link, 30 km .. hardware:

Side A:

RB433h, xr 600, 32 db directional antenna

Side B:
Same thing, but RB433 without H. - This point is connected directly to the ‘internet’ and have public ip.

Signal strength when we were aligning antenna’s where -53 db, now it’s -61 (possible because antenna is frozen?).

Without Nstream, we could push 17mbps in one direction, 2 mbps in both direction, with a stable link and low ping. With nstream, we push 35 mbps in one direction, and 15 mbps in both, with stable ping time, and stable link quality.

However, we have 2/2 mbps, internet link … a new shiny one, going throught that link, and I just ran a ftp to my server in texas, both download and upload … my upload peaks to 3mbps, but download is a little weird. - I’m doing this from linux box, using point a/b as bridge between it and internet.

It varies from 1.3 mbps to 1.8 mbps, and when i shutdown upload, download goes around 1.4 - 2.5 mbps. The link is capable of going 2/2 simult.

However, on bandwidth test between point A and B, as I said … i get 15mbps u/down tcp traffic.

One thing more I noticed, when download is running (no matter if I do upload too), rb433h (point A, no public IP, Point B do NAT for the whole ip class) it suffocates under cpu load. Even those 1.8 mbps average download saturates the cpu … around 80 %, while rb433 is doing fine.

Also, rb433h, point a, switches active-fan from main to aux, every few seconds
[admin@433H] /system health> p
fan-mode: auto
use-fan: main
active-fan: auxiliary
voltage: 22.7
[admin@433H] /system health> p
fan-mode: auto
use-fan: main
active-fan: main
voltage: 22.7
[admin@433H] /system health>

I hit p every second, and almost every second it switches between aux and main on it, however, point B does this as well.

Can someone please explain .. ?

And one more thing, just crossed my mind … point A (rb433h, the one with high cpu load), is in AP mode, point B is in station mode.

And one more… ping from point A to point B, is always around 1-2 ms. doing that lazy 1.5 mbps download, or doing 30mbps with mikrotik’s bandwidth test.