<br><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Nov 26, 2012 at 9:22 AM, Michael Richardson <span dir="ltr"><<a href="mailto:mcr@sandelman.ca" target="_blank">mcr@sandelman.ca</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><br>
>>>>> "Dave" == Dave Taht <<a href="mailto:dave.taht@gmail.com">dave.taht@gmail.com</a>> writes:<br>
Dave> to move the fq_codel algorithm into the cable modem, OR to have the<br>
Dave> cable modem exert flow control like ADSL modems do. Then have the<br>
Dave> smarter device (the router) then do smarter queuing.<br>
<br>
I was unaware that DSL models were doing this... is this with GbE<br>
ethernet level XON/XOFF? Should I assume that any DSL model with less<br>
than a GbE sync doesn't/can't have it? Any brands you'd like to<br>
acknowledge?<br></blockquote><div><br></div><div>We don't know that all DSL modems do this.</div><div><br></div><div>However, in corresponding with Michael Tremer about his results (documented here <a href="http://planet.ipfire.org/post/ipfire-2-13-tech-preview-fighting-bufferbloat">http://planet.ipfire.org/post/ipfire-2-13-tech-preview-fighting-bufferbloat</a>), it appears that a DSL modem commonly used in Germany does implement Ethernet flow control (or he could not have gotten the results he reports there at all; all he did was turn on fq_codel on the x86 geode router he is using for IPfire). Whether this is "standard" in DSL modems, I have no clue (anyone want to plow through DSL standards documents?).<div style="width:16px;height:16px;display:inline-block">
</div></div><div><br></div><div>I've been unable to find a supplier in the U.S. for this particular DSL modem. Short of bidding on ebay in Europe, I was defeated (despite there being 10's of millions of them in Germany); this isn't too surprising, as the modem is supplied by the carrier in this case.</div>
<div><br></div><div>Note that I'm testing a DGN3500 this week with John Crispin (blogic) which has an integrated Lantiq DSL chip (along with Atheros radios) running fq_codel that John maintains. That may be a better option for DSL, as it can be purchased easily via Amazon. Wish us luck (though John's early data looks really nice).</div>
<div> - Jim</div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<span class=""><font color="#888888"><br>
--<br>
] He who is tired of Weird Al is tired of life! | firewalls [<br>
] Michael Richardson, Sandelman Software Works, Ottawa, ON |net architect[<br>
] <a href="mailto:mcr@sandelman.ottawa.on.ca">mcr@sandelman.ottawa.on.ca</a> <a href="http://www.sandelman.ottawa.on.ca/" target="_blank">http://www.sandelman.ottawa.on.ca/</a><div style="width:16px;height:16px;display:inline-block">
</div> |device driver[<br>
Kyoto Plus: watch the video <<a href="http://www.youtube.com/watch?v=kzx1ycLXQSE" target="_blank">http://www.youtube.com/watch?v=kzx1ycLXQSE</a><div style="width:16px;height:16px;display:inline-block"> </div>><br>
then sign the petition.<br>
</font></span><div class=""><div class="h5">_______________________________________________<br>
Cerowrt-devel mailing list<br>
<a href="mailto:Cerowrt-devel@lists.bufferbloat.net">Cerowrt-devel@lists.bufferbloat.net</a><br>
<a href="https://lists.bufferbloat.net/listinfo/cerowrt-devel" target="_blank">https://lists.bufferbloat.net/listinfo/cerowrt-devel</a><div style="width:16px;height:16px;display:inline-block"> </div><br>
</div></div></blockquote></div><br></div>