Nv2 QoS

[abyss]

Hi Everybody,

I would like to have more details about NV2 QoS…

• What is exactly the “built-in QoS policy algorithm” when nv2-qos=default is set ? Does it prioritize by packet size or something else ?
• If mangle rules with set-priority are used, does it pass over nv2 qos default or do I need to use frame-priority ?
• Changing wireless interface queue type to pcq does affect nv2 qos also ?

Thanks and best Regards,
Julien Hoppe
http://www.wifx.net

[rickfrey]

Check out this Wiki page. It explains it pretty well. http://wiki.mikrotik.com/wiki/Manual:Nv2

[abyss]

Thanks,

I already use nv2 in a large network, with some good results, I try to make it better, prevent pppoe disconnection, saturation, etc…
But I didn’t answer what is exactly the “built-in QoS policy algorithm” ?

I should update the documentation if I can get an answer… For the 2 other questions, I can maybe do some tests…

Best regards,
Julien Hoppe

[CyberTod]

Rather old topic, but better ask here instead of making a new one.
As other have asked - what exactly is the ‘default’ value for NV2 QoS. And please don’t send me to the wiki. All that is written there is ‘based on size and type’. Ok but what exactly does that mean. I guess smaller packets get higher priority - that is good. But what about type - which types get higher priority and what exactly type means here. I know it is a proprietary protocol after all and don’t need very detailed information, but at least better than this.
Does it somehow at least reads DSCP,TOS and if not can Mikrotik team implement an option - from DSCP. The reason I ask for this option is because if I mangle all packets with target set priority from dscp (high 3 bits) it works, but on a 100mbit+ link that uses a lot of CPU and a Netbox 5 goes to 70+ % and that increases latency even though icmp has priority 7 and almost everything else has lower priority.
And last I don’t like other vendors, but Airmax reads DSCP information by default. I don’t mind the extra rules in my config, but want to know more how to make this work with least CPU strain.

[WirelessRudy]

@CyberTod

Rather old topic, but better ask here instead of making a new one.
As other have asked - what exactly is the ‘default’ value for NV2 QoS. And please don’t send me to the wiki. All that is written there is ‘based on size and type’. Ok but what exactly does that mean. I guess smaller packets get higher priority - that is good. But what about type - which types get higher priority and what exactly type means here. I know it is a proprietary protocol after all and don’t need very detailed information, but at least better than this.
Does it somehow at least reads DSCP,TOS and if not can Mikrotik team implement an option - from DSCP. The reason I ask for this option is because if I mangle all packets with target set priority from dscp (high 3 bits) it works, but on a 100mbit+ link that uses a lot of CPU and a Netbox 5 goes to 70+ % and that increases latency even though icmp has priority 7 and almost everything else has lower priority.
And last I don’t like other vendors, but Airmax reads DSCP information by default. I don’t mind the extra rules in my config, but want to know more how to make this work with least CPU strain.

Did you ever find out?

[CyberTod]

No. Haven’t found more information on what the default actually is.
All I am sure is that it gives some priority to smaller packets.