[Cerowrt-devel] I have a Lantiq ADSL modem under OpenWRT; Willing to test cake

[Frank Horowitz]

Heh. There’s an old saying around the traps: “Beware of programmers with soldering irons.” ;-) But thanks!

Having a serial line access to OpenWRT boxes has been fairly standard over the years, and IIRC, this is about the 4th or 5th one of those I’ve had to do this for. Fortunately, the initial tftp-server installation worked first time for me a few months back when I built the box.

Just a word to the wise, in case anyone is trying to follow along: Do NOT try to install git on a TDW8970 under BB (to grab Rich Brown’s OpenWRTScripts repository for betterspeedtest.sh etc. I ran out of flash, and had to re-install.  Instead, just copy the latest-and-greatest from another machine.  It took me a couple of hours to figure out that the DSL firmware blob was getting blown away each reboot, and get things back to running again, but I am now running betterspeedtest and friends (with less than spectacular results — I suspect congestion upstream since I’ve notice that the performance is time-of-day related, and this is prime movie-streaming time in my neighborhood).

BTW, I’m compiling OpenWRT HEAD on an ubuntu box (from the instructions in http://www.acme-dot.com/building-openwrt-14-07-barrier-breaker-on-ubuntu-and-os-x/).  That way, I _should_ (in principle) be able to stash exactly what I need into the build, including the kernel module required for cake… Fingers crossed.

Cheers,
	Frank Horowitz

On Jul 12, 2015, at 4:26 PM, Fred Stratton <fredstratton at imap.cc> wrote:

> As someone on the periphery, I congratulate you in getting the TP-Link device flashed via a serial port. I bricked one, and moved to the Buffalo WMBR-HP-G300H, which has 32MB of faster flash.
> 
> Barrier Breaker is a very stable release for Lantiq devices. I had 120 days uptime, and few retrains.
> 
> Cake requires a later kernel than Barrier Breaker, so you would need to reflash a device with 8MB flash over a serial link with a less stable build of Chaos Calmer.
> 
> If you intend to try cake, I suggest a device such as the one I mention would give you a quieter life. It is freely available in Europe: I do not know about the US.
> 
> I remember there being very little free flash on the TP-Link, as you say.
> 
> 
> 
> On 12/07/15 21:02, Frank Horowitz wrote:
>> G’Day folks,
>> 
>> Just reading through the recent thread started by Fred Stratton: "Correct syntax for cake commands and atm issues.”
>> 
>> It appears that Fred’s configuration is for a WNDR3800 running Cero/Lupin connected via an ethernet segment to a DSL modem to the outside world.
>> 
>> My setup is  as follows. I have a Lantiq based TPlink TDW8970 as my actual DSL modem to the outside world running OpenWRT BarrierBreaker (and using the luci sqm scripts from that release). That TDW8970 is connected via an ethernet segment to a WNDR3700v2 running cero 3.10.50-1 (which is my router, leftover from using the junker DSL modem from my ISP that used to sit where the TDW8970 sits now).
>> 
>> My DSL line-sync rates are 3712 Kb/s down and 448 Kb/s up. (I live out in the boonies, and refuse to do business with Time Warner Cable, so Frontier it is, complete with crappy speeds). As I understand their network topology, this isn’t a central office DSLAM, but a fiber-to-the-node thingy. The upshot is that unlike my last place with DSL to a central office, I have very stable line-sync rates with noise margins (as reported by luci) of about 38dB down and 28dB up. (If only Frontier would sell me a higher speed link, but I digress.)
>> 
>> So, If there is any interest from the group in testing cake on such a marginal DSL configuration, I’m ready to give it a shot, but will need some instructions. Be aware that the TDW8970 is fairly constrained for overlay filespace — I currently have only ~800k free — so the install might be nontrivial.
>> 
>> Cheers,
>> 	Frank Horowitz
>> 
>> 
>> 
>> 
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>> 
>> Cerowrt-devel at lists.bufferbloat.net
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> 

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