Re: [Cerowrt-devel] Ubnt builds

[Dave Taht <dave.taht@gmail.com>]

The ubnt builds are a bit out of date (part of my test deployment of
fq_codel at a campground here - the yurtlab!
http://snapon.lab.bufferbloat.net/~d/lupin/yurtlab.jpg which is
blessedly free
of competing wifi signals)

They are also a little specialized. Among other things, they have my
ssh public key in them,
and are keyed to local dns, they rely on the babel protocol to route
and mesh together, although they do come up presently on a fixed ip
address that needs to be changed, instead of relying on AHCP for their
IPs and dns.

All of quagga (including OSPF) IS built, it's just that babel is the default.

In working with this build and test deployment I exposed some problems
with memory usage in codel and the ath9k driver. Quagga will get
OOM-killed under heavy loads, such as RTP and UDP flooding across
multiple diffserv values, on the 2HP boxes in AP mode. The p2p
backbone (nanostation M5s) has never crashed on me.

This points long term towards developing a "mfq_codel", which would
have one qdisc and *one* set of buffers that controls all four
hardware queues. However, try as I might, I haven't wrapped my head
around how to merge the code for sch_mq and sch_fq_codel, in a way
that would work. (?)

Aside from that it's working rather well, and the hacks I have in
place now to reduce skb size seem to help a lot.

Now that the memory problems are mostly beaten I will be doing a
respin and re-deployment towards the end of the month. If I can build
something a little more generic and easy to deploy on ubnt for others,
I will do so, getting to where all this code runs well in 32MB is
rather important to me.

Let me know.

On Thu, Sep 6, 2012 at 4:17 AM, Andy S <andys@bristolwireless.net> wrote:
> I see that there are UBNT builds available for specific deployment
> scenarios; we use Ubiquiti Bullet M5's on some parts of our (city-wide)
> 5.8Ghz wireless network, but they don't support OSPF, so if any of the
> builds of Cerowrt support Bullet M5 and OSPF (I see the Quagga-ospf  modules
> available in the main devel builds) - we would be interested to hear/test!
>
> Cheers,
>
> A
> --
> http://www.bristolwireless.net/  | 0117 325 0067 |
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>
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-- 
Dave Täht
http://www.bufferbloat.net/projects/cerowrt/wiki - "3.3.8-17 is out
with fq_codel!"