I had a really strange problem. I solved it, but I want to share this experience to better understand it.
I have a bridged network with a gateway on Optical Fiber internet connection and some wireless APs to allow users to connect using their CPE.
I used 5GHz-A and 802.11 or nstreme and I want to switch to 5GHz-N with nv2 as my users grown up.
On the gateway I have user manager to limit my users.
When I switched to nv2 on one of my AP to test it I had a speed drop.
If an user had 30Mbps stable before, with nv2 is super unstable and only 10-14Mbps.
Users with 10Mbps were stable before, with nv2 unstable and only 5-6Mbps.
This is an user with nv2 that had stable 30Mbps in nstreme: The strange thing is that if i remove the limit, without changing anything else, this is the speed: Very strange!
Searching on the forum i found http://forum.mikrotik.com/viewtopic.php?f=13&t=77052.
I set this on the AP:
/queue type set default-small kind=sfq
Why, on the same AP, same users, same frequency, but different protocol, pfifo performed well with the older protocols and not with nv2?
Why is sfq better? Is there any side effect using sfq?
I also tried red and pcq and the results are the same: good as sfq.
Only using pfifo and mq pfifo I have this issue.
Can you please explain me why this happens?
On the gateway I'm using pfifo on the WAN as queue type and I'm not having any issue.
Do you think changing it to sfq, red, or mq pfifo can help?
I read about queues on the wiki but I can't understand why I'm facing this.