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

[Sebastian Moeller]

Hi Mikael,

thanks a lot.

On Jun 28, 2015, at 19:32 , Mikael Abrahamsson <swmike at swm.pp.se> wrote:

> On Sun, 28 Jun 2015, Sebastian Moeller wrote:
> 
>> 	This looks great, could you by any chance confirm that the GUI does allow to configure cake and that you can or can not set the overhead for cake in the link layer adjustments (LLA) tab? (select cake as link layer adjustment method, and put 42 into the overhead field and report the output of “tc -d qdisc” before and after selecting cake as LLA). @Toke: If that works, I think we can safely push these changes into the openwrt repositories...
> 
> Here is the output. What I don't see is both ingress and egress ECN markings even though I have selected this in the advanced configuration under Queue Discipline.

	Good point, I have not connected these fields with cake yet, will do in the near future. I believe cake defaults to ECN, but if no packets are marked during a test, but rather dropped, something is fishy...

> 
> Before changing LLA:
> 
> root at OpenWrt:~# tc -d qdisc
> qdisc htb 1: dev eth0 root refcnt 9 r2q 10 default 12 direct_packets_stat 0 ver 3.17 direct_qlen 532
> qdisc cake 110: dev eth0 parent 1:11 unlimited diffserv4 flows raw
> qdisc cake 120: dev eth0 parent 1:12 unlimited diffserv4 flows raw
> qdisc cake 130: dev eth0 parent 1:13 unlimited diffserv4 flows raw
> qdisc ingress ffff: dev eth0 parent ffff:fff1 ----------------
> qdisc mq 0: dev eth1 root
> qdisc fq_codel 0: dev eth1 parent :1 limit 1024p flows 1024 quantum 300 target 5.0ms interval 100.0ms ecn
> qdisc fq_codel 0: dev eth1 parent :2 limit 1024p flows 1024 quantum 300 target 5.0ms interval 100.0ms ecn
> qdisc fq_codel 0: dev eth1 parent :3 limit 1024p flows 1024 quantum 300 target 5.0ms interval 100.0ms ecn
> qdisc fq_codel 0: dev eth1 parent :4 limit 1024p flows 1024 quantum 300 target 5.0ms interval 100.0ms ecn
> qdisc fq_codel 0: dev eth1 parent :5 limit 1024p flows 1024 quantum 300 target 5.0ms interval 100.0ms ecn
> qdisc fq_codel 0: dev eth1 parent :6 limit 1024p flows 1024 quantum 300 target 5.0ms interval 100.0ms ecn
> qdisc fq_codel 0: dev eth1 parent :7 limit 1024p flows 1024 quantum 300 target 5.0ms interval 100.0ms ecn
> qdisc fq_codel 0: dev eth1 parent :8 limit 1024p flows 1024 quantum 300 target 5.0ms interval 100.0ms ecn
> qdisc htb 1: dev ifb4eth0 root refcnt 2 r2q 10 default 12 direct_packets_stat 0 ver 3.17 direct_qlen 32
> qdisc cake 110: dev ifb4eth0 parent 1:11 unlimited diffserv4 flows raw
> qdisc cake 120: dev ifb4eth0 parent 1:12 unlimited diffserv4 flows raw
> qdisc cake 130: dev ifb4eth0 parent 1:13 unlimited diffserv4 flows raw
> 
> After changing LLA:
> 
> root at OpenWrt:~# tc -d qdisc
> qdisc htb 1: dev eth0 root refcnt 9 r2q 10 default 12 direct_packets_stat 0 ver 3.17 direct_qlen 532
> linklayer ethernet overhead 42
> qdisc cake 110: dev eth0 parent 1:11 unlimited diffserv4 flows raw
> qdisc cake 120: dev eth0 parent 1:12 unlimited diffserv4 flows raw
> qdisc cake 130: dev eth0 parent 1:13 unlimited diffserv4 flows raw
> qdisc ingress ffff: dev eth0 parent ffff:fff1 ----------------
> qdisc mq 0: dev eth1 root
> qdisc fq_codel 0: dev eth1 parent :1 limit 1024p flows 1024 quantum 300 target 5.0ms interval 100.0ms ecn
> qdisc fq_codel 0: dev eth1 parent :2 limit 1024p flows 1024 quantum 300 target 5.0ms interval 100.0ms ecn
> qdisc fq_codel 0: dev eth1 parent :3 limit 1024p flows 1024 quantum 300 target 5.0ms interval 100.0ms ecn
> qdisc fq_codel 0: dev eth1 parent :4 limit 1024p flows 1024 quantum 300 target 5.0ms interval 100.0ms ecn
> qdisc fq_codel 0: dev eth1 parent :5 limit 1024p flows 1024 quantum 300 target 5.0ms interval 100.0ms ecn
> qdisc fq_codel 0: dev eth1 parent :6 limit 1024p flows 1024 quantum 300 target 5.0ms interval 100.0ms ecn
> qdisc fq_codel 0: dev eth1 parent :7 limit 1024p flows 1024 quantum 300 target 5.0ms interval 100.0ms ecn
> qdisc fq_codel 0: dev eth1 parent :8 limit 1024p flows 1024 quantum 300 target 5.0ms interval 100.0ms ecn
> qdisc htb 1: dev ifb4eth0 root refcnt 2 r2q 10 default 12 direct_packets_stat 0 ver 3.17 direct_qlen 32
> linklayer ethernet overhead 42
> qdisc cake 110: dev ifb4eth0 parent 1:11 unlimited diffserv4 flows raw
> qdisc cake 120: dev ifb4eth0 parent 1:12 unlimited diffserv4 flows raw
> qdisc cake 130: dev ifb4eth0 parent 1:13 unlimited diffserv4 flows raw

	This is showing tha the cake setup went wrong. It is using HTB as shaper instead of cake. There should be no cake line. Could you post your /usr/lib/sqm/simple.qos file please.

Best Regards
	Sebastian

> 
> -- 
> Mikael Abrahamsson    email: swmike at swm.pp.se