What happens if the SoC ports aren't saturated, but the link is GigE?  That is, suppose this is an access link to a GigE home or office LAN with wired servers?


On Tuesday, June 30, 2015 9:58am, "Mikael Abrahamsson" <swmike@swm.pp.se> said:



> On Mon, 29 Jun 2015, dpreed@reed.com wrote:
> 
> > I would love to try out cake in my environment. However, as a
> > non-combatant, it would be nice to have an instruction sheet on how to
> > set the latest version up, and what hardware it works best on
> > (WRT1200AC?). Obviously this is a work in progress, so that will
> > change, but it would be nice to have a summarized wiki page.
> 
> WRT1200AC seems to be the most powerful around, however it can't really be
> used for PHY 100M testing since both SoC ports goes to a switch that then
> terminate all the external ports. Therefore it's hard to test
> AQM-on-metal with it because the SoC links are never saturated, you always
> have to use an encompassing shaper (htb).
> 
> Here is a short writeup from what I learnt from the past days. I haven't
> verified every step, this is from memory.
> 
> Get ubuntu 14.04 LTS according to:
> 
> http://www.acme-dot.com/building-openwrt-14-07-barrier-breaker-on-ubuntu-and-os-x/
> 
> Check out either trunk ("git clone git://git.openwrt.org/openwrt.git") or
> Chaos Calmer RC ("clone git://git.openwrt.org/15.05/openwrt.git").
> 
> Copy feeds.conf.default to feeds.conf in the openwrt dir. Add first in
> file:
> 
> "src-git cero https://github.com/dtaht/ceropackages-3.10.git"
> 
> scripts/feeds update -a
> scripts/feeds install luci luci-app-sqm sqm-scripts tc-adv ip ethtool
> kmod-sched-cake kmod-sched-fq_pie
> 
> make menuconfig
> 
> Now comes the hard part because you want to change * for everything that
> you want to install as default in the resulting image. M means it compiles
> the package but doesn't include it in the resulting image (for utilities).
> What the above does is only to make it available to "make menuconfig" as
> packages. I tend to choose traceroute, tcpdump and all the other nice to
> have utilities. You can download and use
> <http://swm.pp.se/aqm/wrt1200ac.config> (it's for trunk, ie the nightly,
> don't know if it works for CC RC2) and put as .config in the openwrt
> directory as a template.
> 
> I recommend to build on a fast machine with SSD, i/o is usually the
> limiting factor. I use an 3.5GHz core i5 dual core (4 with HT) and SSD,
> and with "make -j 10" it compiles in an hour or so. Subsequent compiles
> are quicker.
> 
> You need to find your platform etc. If you get an WRT1200AC you can use my
> builds if you want to. After this you need to go into the luci sqm scripts
> and set queueing algorithm etc.
> 
> some good commands to see what's going on:
> 
> tc -d qdisc
> tc -s qdisc
> 
> Hope it helps.
> 
> --
> Mikael Abrahamsson email: swmike@swm.pp.se
>