Re: [Cerowrt-devel] performance numbers from WRT1200AC (Re: Latest build test - new sqm-scripts seem to work; "cake overhead 40" didn't)

[Mikael Abrahamsson <swmike@swm.pp.se>]

On Sun, 28 Jun 2015, Sebastian Moeller wrote:

> Could you post the result of:
>
> cat /etc/config/sqm
>
> from the router, please? And the output of
>
> /etc/init.d/sqm stop ; /etc/init.d/sqm start
>
> this might give me a clue where to look...

root@OpenWrt:~# cat /etc/config/sqm

config queue 'eth1'
         option script 'simple.qos'
         option interface 'eth0'
         option qdisc_advanced '1'
         option squash_dscp '0'
         option squash_ingress '0'
         option ingress_ecn 'ECN'
         option egress_ecn 'ECN'
         option qdisc_really_really_advanced '0'
         option enabled '1'
         option download '500000'
         option upload '500000'
         option qdisc 'cake'
         option linklayer 'ethernet'
         option overhead '42'

root@OpenWrt:~# /etc/init.d/sqm stop
SQM: Trying to start/stop SQM on all interfaces.
SQM: run.sh stop
SQM: /usr/lib/sqm/run.sh Stopping SQM on interface: eth0
SQM: ifb associated with interface eth0:
SQM: trying to create new IFB: ifb4eth0
RTNETLINK answers: File exists
SQM: /usr/lib/sqm/stop.sh: Stopping eth0
SQM: ifb associated with interface eth0:
SQM: /usr/lib/sqm/run.sh SQM qdiscs on eth0 removed
root@OpenWrt:~# /etc/init.d/sqm start
SQM: Trying to start/stop SQM on all interfaces.
SQM: /usr/lib/sqm/run.sh Queue Setup Script: /usr/lib/sqm/simple.qos
SQM: ifb associated with interface eth0:
SQM: trying to create new IFB: ifb4eth0
RTNETLINK answers: File exists
SQM: cake
SQM: Keeping differentiated services code points (DSCP) from ingress.
SQM: STAB: stab mtu 2047 tsize 512 mpu 0 overhead 42 linklayer ethernet

This command never completes. I added -x to simple.qos and the RTNETLINK 
is from:

+ /usr/sbin/ip link add name ifb4eth0 type ifb
RTNETLINK answers: File exists

and the last commands that execute are:

SQM: STAB: stab mtu 2047 tsize 512 mpu 0 overhead 42 linklayer ethernet
+ echo stab mtu 2047 tsize 512 mpu 0 overhead 42 linklayer ethernet
+ get_cake_lla_string
+ STABSTRING=
+ [ tc_stab = cake -a ethernet != none ]
+ sqm_logger
+ logger -t SQM -s

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se