<div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-family:monospace"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Apr 22, 2020 at 4:48 PM Dave Taht <<a href="mailto:dave.taht@gmail.com" target="_blank">dave.taht@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On Wed, Apr 22, 2020 at 2:04 AM Luca Muscariello <<a href="mailto:muscariello@ieee.org" target="_blank">muscariello@ieee.org</a>> wrote:<br>
><br>
><br>
><br>
> On Wed, Apr 22, 2020 at 12:44 AM Dave Taht <<a href="mailto:dave.taht@gmail.com" target="_blank">dave.taht@gmail.com</a>> wrote:<br>
>><br>
>> On Tue, Apr 21, 2020 at 3:33 PM Jonathan Morton <<a href="mailto:chromatix99@gmail.com" target="_blank">chromatix99@gmail.com</a>> wrote:<br>
>> ><br>
>> > > On 22 Apr, 2020, at 1:25 am, Thibaut <<a href="mailto:hacks@slashdirt.org" target="_blank">hacks@slashdirt.org</a>> wrote:<br>
>> > ><br>
>> > > My curiosity is piqued. Can you elaborate on this? What does <a href="http://free.fr" rel="noreferrer" target="_blank">free.fr</a> do?<br>
>> ><br>
>> > They're a large French ISP. They made their own CPE devices, and debloated both them and their network quite a while ago. In that sense, at least, they're a model for others to follow - but few have.<br>
>> ><br>
>> > - Jonathan Morton<br>
>><br>
>> they are one of the few ISPs that insisted on getting full source code<br>
>> to their DSL stack, and retained the chops to be able to modify it. I<br>
>> really admire their revolution v6 product. First introduced in 2010,<br>
>> it's been continuously updated, did ipv6 at the outset, got fq_codel<br>
>> when it first came out, and they update the kernel regularly. All<br>
>> kinds of great features on it, and ecn is enabled by default for those<br>
>> also (things like samba). over 3 million boxes now I hear....<br>
>><br>
>> with <1ms of delay in the dsl driver, they don't need to shape, they<br>
>> just run at line rate using three tiers of DRR that look a lot like<br>
>> cake. They shared their config with me, and before I lost heart for<br>
>> future internet drafts, I'd stuck it here:<br>
>><br>
>> <a href="https://github.com/dtaht/bufferbloat-rfcs/blob/master/home_gateway_queue_management/middle.mkd" rel="noreferrer" target="_blank">https://github.com/dtaht/bufferbloat-rfcs/blob/master/home_gateway_queue_management/middle.mkd</a><br>
>><br>
>> Occasionally they share some data with me. Sometimes I wish I lived in<br>
>> paris just so I could have good internet! (their fiber offering is<br>
>> reasonably buffered (not fq_codeled) and the wifi... maybe I can get<br>
>> them to talk about what they did)<br>
>><br>
>> When <a href="http://free.fr" rel="noreferrer" target="_blank">free.fr</a> shipped fq_codel 2 months after we finalized it, I<br>
>> figured the rest of the world was only months behind. How hard is it<br>
>> to add 50 lines of BQL oriented code to a DSL firmware?<br>
>><br>
><br>
> Free has been using SFQ since 2005 (if I remember well).<br>
> They announced the wide deployment of SFQ in the <a href="http://free.fr" rel="noreferrer" target="_blank">free.fr</a> newsgroup.<br>
> Wi-Fi in the <a href="http://free.fr" rel="noreferrer" target="_blank">free.fr</a> router was not as good though.<br>
<br>
They're working on it. :)<br>
<br>
> In Paris there is a lot of GPON now that is replacing DSL. But there is<br>
> a nation-wide effort funded by local administrations to get fiber<br>
> everywhere. There are small towns in the countryside with fiber.<br>
> Public money has made, and is making that possible.<br>
> There is still a little of Euro-DOCSIS, but frankly compared to fiber<br>
> it has no chance to survive.<br>
<br>
I am very, very happy for y'all. Fiber has always been the sanest<br>
thing. Is there<br>
a SPF+ gpon card yet I can plug into a convention open source router yet?<br>
<br>
><br>
> I currently have 2Gbps/600Mbps access with <a href="http://orange.fr" rel="noreferrer" target="_blank">orange.fr</a> and <a href="http://free.fr" rel="noreferrer" target="_blank">free.fr</a> has a subscription<br>
> at 10Gbps GPON. I won't tell you the price because you may feel depressed<br>
> compared to other countries where prices are much higher.<br>
<br>
I'd emigrate!!!<br>
<br>
> The challenge becomes to keep up with these link rates in software<br>
> as there is a lot of hardware offloading.<br></blockquote><div><br></div><div><br></div><div><div class="gmail_default" style="font-family:monospace">I just meant that these routers tend to use HW offloading </div><div class="gmail_default" style="font-family:monospace">and kernel qdiscs may be bypassed.</div></div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
At this point, I kind of buy the stanford sqrt(bdp) argument. All you<br>
really need for gigE+ fiber access to work well<br>
for most modern traffic is a fairly short fifo (say, 20ms). Any form<br>
of FQ would help but be hardly noticible. I think<br>
there needs to be work on the hop between the internet and the subscriber...<br>
<br>
Web traffic is dominated by RTT above 40mbit (presently).<br>
streaming video traffic - is no more than 20Mbit, and your occasional<br>
big download is a dozen big streams that would<br>
bounce off a short fifo well.<br>
gbit access to the home is (admittedly glorious, wonderful!) overkill<br>
for all present forms of traffic.<br>
<br>
I'm pretty sure if I had gig fiber I could come up with a way to use<br>
it up (exiting the cloud entirely comes to mind), but<br>
lacking new applications that demand that much bandwidth...<br>
<br>
I of course, would like to see lola ( <a href="https://lola.conts.it/" rel="noreferrer" target="_blank">https://lola.conts.it/</a> ) finally<br>
work, and videoconferencing and game stream with high rates and faster<br>
(even raw) encoding also has potential to reduce e2e latencies<br>
enormously at that layer.<br>
<br>
><br>
> As soon as 802.11ax becomes the norm, software scheduling will become<br>
> a challenge.<br>
<br>
Do you mean in fiber or wireless? wireless is really problematic at ANY speed.<br></blockquote><div><br></div><div><div class="gmail_default" style="font-family:monospace">I meant that software scheduling becomes a challenge for the same</div><div class="gmail_default" style="font-family:monospace">reason as above. Increase in total throughput of the box</div><div class="gmail_default" style="font-family:monospace">will call for hardware offloading and kernel qdisc may be bypassed.</div><div class="gmail_default" style="font-family:monospace"><br></div><div class="gmail_default" style="font-family:monospace">It is not a challenge per se, it is a challenge because traffic</div><div class="gmail_default" style="font-family:monospace">may not be managed by the kernel.</div><br></div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
at gfiber, the buffering moved to the wifi, and there are other<br>
problems that really impact achievable bandwidth. When I was last in<br>
paris, I could "hear" 300+ access points from my apt, and could only<br>
get 100-200kbit per second out of the wireless n ap I had, unless I<br>
cheated and stuck my traffic in the VI queue. A friend of mine there,<br>
couldn't even get wifi across the room! Beacons ate into a lot of the<br>
available<br>
bandwidth. Since 5ghz (and soon 6ghz - is 6E a thing in france) is<br>
shorter range I'm hoping that's got better, but with<br>
802.11ac and ax peeing on half the wifi spectrum by default, I imagine<br>
achievable rates in high density locations with many APs will be very<br>
low... and very jittery... and thus still require good ATF, fq, and<br>
aqm technologies.<br>
<br>
I have high hopes for OFDMA and DU but thus far haven't found an AP<br>
doing it. I'm not sure what to do about the beaconing problem except<br>
offer a free tradein to all my neighbors still emitting G style<br>
frames....<br>
<br>
And in looking over some preliminary code for the mt76 ax chip, I<br>
worry about both bad design of the firmware, and<br>
insufficient resources on-chip to manage well.<br>
<br>
How is the 5G rollout going in france?<br></blockquote><div><br></div><div><div class="gmail_default" style="font-family:monospace">Good question. I've just seen a speed test at Gbps on a phone</div><div class="gmail_default" style="font-family:monospace">which can drain your battery in less than 5 minutes. Amazing tech!</div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
I recently learned that much of japan is... wait for it... wimax.<br>
<br>
><br>
> Luca<br>
<br>
<br>
<br>
-- <br>
Make Music, Not War<br>
<br>
Dave Täht<br>
CTO, TekLibre, LLC<br>
<a href="http://www.teklibre.com" rel="noreferrer" target="_blank">http://www.teklibre.com</a><br>
Tel: 1-831-435-0729<br>
</blockquote></div></div>