[Cerowrt-devel] [Bloat] [aqm] the side effects of 330ms lag in the real world

Jim Gettys jg at freedesktop.org
Tue Apr 29 12:44:38 EDT 2014

On Tue, Apr 29, 2014 at 3:56 AM, Mikael Abrahamsson <swmike at swm.pp.se>wrote:

> On Tue, 29 Apr 2014, Fred Baker (fred) wrote:
>  Well, we could discuss international communications. I happen to be at
>> Infocom in Toronto, VPN’d into Cisco San Jose, and did a ping to you:
> Yes, but as soon as you hit the long distance network the latency is the
> same regardless of access method. So while I agree that understanding the
> effect of latency is important, it's no longer a meaningful way of selling
> fiber access. If your last-mile is fiber instead of ADSL2+ won't improve
> your long distance latency.

​FIOS bufferbloat is a problem too.

Measured bufferbloat, symmetric 25/25 service in New Jersey at my inlaw's
house is 200ms (on the ethernet port of the Actiontec router provided by
Verizon).  So latency under load is the usual problem.

Why would you think the GPON guys are any better in principle than cable or
DSL?  Cable and DSL may be somewhat worse, just because it is older and
downward compatibility means that new modems on low bandwidth tiers are
even more grossly over buffered.
You can look at the netalyzr scatter plots in

Now, if someone gives me real fiber to the home, with a real switch fabric
upstream, rather than gpon life might be somewhat better (if the switches
aren't themselves overbuffered....  But so far, it isn't.
                                      - Jim

                                  - Jim

                                                         - Jim


> --
> Mikael Abrahamsson    email: swmike at swm.pp.se
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