[Cerowrt-devel] [Bloat] sqm-scripts on WRT1900AC

David Lang david at lang.hm
Mon May 25 19:55:37 EDT 2015

looking at the 1900ac vs the 1200ac, one question. what is needed to benefit 
from the 3x3 vs the 2x2?

In theory the 3x3 can transmit to three clients at the same time while the 2x2 
can transmit to two clients at the same time.

But does the client need specific support for this? (mimo or -ac) Or will this 
work for 802.11n clients as well?

David Lang

On Sat, 23 May 2015, Aaron Wood wrote:

> Date: Sat, 23 May 2015 23:19:19 -0700
> From: Aaron Wood <woody77 at gmail.com>
> To: bloat <bloat at lists.bufferbloat.net>,
>     cerowrt-devel <cerowrt-devel at lists.bufferbloat.net>,
>     Dave Taht <dave.taht at gmail.com>
> Subject: Re: [Bloat] sqm-scripts on WRT1900AC
> After more tweaking, and after Comcast's network settled down some, I have
> some rather quite nice results:
> http://burntchrome.blogspot.com/2015/05/sqm-scripts-on-linksys-wrt1900ac-part-1.html
> So it looks like the WRT1900AC is a definite contender for our faster cable
> services.  I'm not sure if it will hold out to the 300Mbps that you want,
> Dave, but it's got plenty for what Comcast is selling right now.
> -Aaron
> P.S.  Broken wifi to the MacBook was a MacBook issue, not a router issue
> (sorted itself out after I put the laptop into monitor mode to capture
> packets).
> On Sat, May 23, 2015 at 10:17 PM, Aaron Wood <woody77 at gmail.com> wrote:
>> All,
>> I've been lurking on the OpenWRT forum, looking to see when the CC builds
>> for the WRT1900AC stabilized, and they seem to be so (for a very "beta"-ish
>> version of stable).
>> So I went ahead and loaded up the daily ( CHAOS CALMER (Bleeding Edge,
>> r45715)).
>> After getting Luci and sqm-scripts installed, I did a few baseline tests.
>> Wifi to the MacBook Pro is...  broken.  30Mbps vs. 90+ on the stock
>> firmware.  iPhone is fine (80-90Mbps download speed from the internet).
>> After some rrul runs, this is what I ended up with:
>> http://www.dslreports.com/speedtest/538967
>> sqm-scripts are set for:
>> 100Mbps download
>> 10Mbps upload
>> fq_codel
>> ECN
>> no-squash
>> don't ignore
>> Here's a before run, with the stock firmware:
>> http://www.dslreports.com/speedtest/337392
>> So, unfortunately, it's still leaving 50Mbps on the table.
>> However, if I set the ingress limit higher (130Mbps), buffering is still
>> controlled.  Not as well, though.  from +5ms to +10ms, with lots of
>> jitter.  But it still looks great to the dslreports test:
>> http://www.dslreports.com/speedtest/538990
>> But the upside?  load is practically nil.  The WRT1900AC, with it's
>> dual-core processor is more than enough to keep up with this (from a load
>> point of view), but it seems like the bottleneck isn't the raw CPU power
>> (cache?).
>> I'll get a writeup with graphs on the blog tomorrow (I hope).
>> -Aaron
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