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@gmail.com>
To: bloat <bloat@lists.bufferbloat.net>,
    cerowrt-devel <cerowrt-devel@lists.bufferbloat.net>,
    Dave Taht <dave.taht@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@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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