sfq unfair on wireless

RouterOS Wireless Networking
1

Hi,

I’ve seen the effect that a single filesharing user “killed” a segment.
He’s limited to 3M/384kBit by wireless Access list. So the segment
does only carry 3M but all clients had 300-500ms ping-times.
Segment is on a RB600 5GHz. Signals are good. CPU is 50%.

I experimented and changed the Queue-Type “wireless-default” from
sfq (default) to bfifo → Pings go down to 2-20ms on this segment
Bandwith usage increases.

I’ve only 4 simple queues for 4 clients on another segment of this
RB600. No Queue-Tree. So this shouldn’t matter.

Any Idea why sfq is unfair in this situation?

Stefan

2

Hello


SFQ algorithm must be able complex and requires lots of CPU load. Guess that is the reason for the latency.

I remember i was trying to experiment Vlan with RB 433 and CPU load was about 73%. I could not finish my test.

Please whats ur CPU load with BFIFO ?

ciao

3

30% carrying 10MBit at the moment. But it was not a cpu problem. Pings to clients at the other segments
of this box was at 3-10ms.

Stefan