I spent most of the last week prepping a talk at stanford; trying to dispel a few delusions.<br><br>The core points that I tried to make:<br><br>* Mice and ants account for a lot of traffic and sfq helps a lot on managing those<br>
* both inbound and outbound rate limiting, fq, and queue management are needed<br>* rrul is cool<br><br><a href="http://mirrors.bufferbloat.net/Talks/Stanford2013/">http://mirrors.bufferbloat.net/Talks/Stanford2013/</a><br>
<br>While it was filmed, we (kathie nichols, eric dumazet, luigi rizzo, and the students) really got distracted with some current issues and way off the slides. It was not my finest hour. I think the modena talk went much better. <br>
<br>I should probably have brought out that slides 20 (pfifo_fast) and 23 (simple_qos, basically) were taken 1 minute apart, on the same connection.... twice the utilization, 1/15th the latency and jitter... to me these two slides should have had everyone in the room running out to make this stuff work on their head ends and cpe a few seconds later. :crickets:<br>
<br>Anyway:<br><br>The rest of the week I spent starting an internet draft, justin and I building up the yurtlab testbed, upgrading hardware there, adding instrumentation and trying to get to where I can track various data points like power failures, packet drops, etc.<br>
<br>* Yes, I'm trying to do an internet draft requiring some form of fq + aqm on the edge networks.<br><br>I'm really terrible at this.<br><br>* Yurtlab<br><br>The deployment (3.7.4-4 and 3.7.5-2 based on wndr3800s, pico station m2hp, and nanostation M5) just survived a 24 hour dance party and total saturation of the links... I really like the m2hps in particular.<br>
<br>I
picked up a couple samsung 2955-dw laser printers. At 100 bucks each,
they were a steal. And it turned out they supported ipv6, and worked
well with linux out of the box. So, yea, I can fiddle with dhcpv6 on
another sort of box.<br clear="all"><br>While I'm talking about hardware, these power controllers are excellent.<br><br><a href="http://www.digital-loggers.com/lpc.html">http://www.digital-loggers.com/lpc.html</a><br>
<br>And I'd got nut in cerowrt to work with these so I'd be able to collect power status.<br><br><a href="http://www.amazon.com/gp/product/B000OTEZ5I/ref=oh_details_o01_s00_i00">http://www.amazon.com/gp/product/B000OTEZ5I/ref=oh_details_o01_s00_i00</a><br>
<br>Turned out really useful, had one flaky spot where the power was 90v or less.<br><br>And, wow...<br><br><a href="http://www.amazon.com/gp/product/B000OTEZ5I/ref=oh_details_o01_s00_i00">http://www.amazon.com/gp/product/B000OTEZ5I/ref=oh_details_o01_s00_i00</a><br>
<br>Lastly, anybody want a couple picostation 2HPs? They only have 4MB of flash and don't do ipv6 and are pretty useless for my purposes....<br><br>* the quest for new hardware<br><br>I continue to look for new hardware to support, as the wndr3800s
remain scarce. I rather appreciate the donations to cerowrt (yurtlab is a different budget), it makes
the quest for this stuff a lot easier, and mentally "gives me a budget" for the quest.<br><br>I'm looking at this board:<br><br><a href="http://www.globalscaletechnologies.com/p-58-mirabox-development-kit.aspx">http://www.globalscaletechnologies.com/p-58-mirabox-development-kit.aspx</a><br>
<br>I'm
grumpy, as it doesn't have an esata interface internally, apparently.
It would have been good to have one of those hooked up to a good flash
disk for active measurements, as a core bottleneck on using a mini-sd
card for storage is the pathetic write speed on that sort of card. Aside
from that, it looked interesting. I also ordered a dreamplug, another
raspberri pi...<br><br>but, darn it, I can't find the perfect hardware. I've been trying to sort out what I want, perhaps I can't do it all on one piece of gear or have to design something that does do things right. I like the zedboard a lot.<br>
<br>At the moment I hope that a guruplug or equivalent can be made to capture 8Mbit/sec of packet headers off a mirrored port.<br><br>Also, openwrt has added support for a new atheros reference board, a couple tplink boards...<br>
<br><br><br>-- <br>Dave Täht<br><br>Fixing bufferbloat with cerowrt: <a href="http://www.teklibre.com/cerowrt/subscribe.html" target="_blank">http://www.teklibre.com/cerowrt/subscribe.html</a>