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 Tue, 30 Jun 2015, Mikael Abrahamsson wrote:

> On Mon, 29 Jun 2015, Dave Taht wrote:
>
>> attached is a patch for that, put it in your 
>> feeds/cero/kmod_sched_cake/patches
>> directory, rebuild (make package/kmod-sched-cake/{clean,compile,install})
>
> I compiled openwrt trunk with linux kernel v4.0 and this patch, and the 
> results are here <http://swm.pp.se/aqm/rrul_150630-cake-l4.0-1.tar>.
>
> As far as I can tell sirq load is higher rather than lower so it doesn't seem 
> like kernel 4.0 has any significant performance benefits, rather the 
> opposite.

So it seems I was mistaken. I now did some tests, with 4.0 with the 
cakepatch, with 3.18 with the cakepatch (that Dave sent the other day), 
and then 3.18 with regular cake as it is in the ceropackages repo 
yesterday.

The columns are mss size, -R or not means reverse, so with -R main packet 
sizes are going in the server->client direction, ie flowing into eth0 
which hosts the htb. Then it's the megabit/s as measured by iperf and then 
the sirq load as seen by top. This jumps around a bit so don't read too 
much into it. However, it looks like 4.0 is actually a slight improvement 
especially for smaller packet sizes and in the server-client direction.

4.0 cakepatch

-M 200 -R   167 M 94%
-M 300 -R   188 M 71%
-M 600 -R   362 M 77%
        -R   861 M 88%
-M 200      350 M 88%
-M 300      380 M 80%
-M 600      680 M 63%
             860 M 55%

3.18 - cakepatch

-M 200 -R   140M 83%
-M 300 -R   167M 72%
-M 600 -R   308M 69%
        -R   750M 82%
-M 200      289M 74%
-M 300      406M 73%
-M 600      780M 80%
             860M 57%

3.18 vanilla

-M 200 -R  150M 90%
-M 300 -R  166M 72%
-M 600 -R  305M 68%
-M     -R  740M 82%
-M 200     304M 80%
-M 300     440M 80%
-M 600     800M 81%
            863M 56%

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