[gentoo-user] Re: TCP Queuing problem

[Kai Krakow]

Am Wed, 21 Sep 2016 12:37:51 -0700
schrieb Grant <emailgrant@×××××.com>:

>  [...]
>  [...]
> >>
> >>
> >> Hi Kai, yesterday I switched my Gentoo router over to handling
> >> PPPoE and pings seem to be working properly now.  The AT&T device
> >> is now functioning as a modem only and passing everything
> >> through.  Today I'll find out if it helps with TCP Queuing and
> >> (supposedly) related http response slowdowns.
> >
> > You may want to set the default congestion control to fq-codel
> > (it's in the kernel) if you're using DSL links. This may help your
> > problem a little bit. It is most effective if you deploy traffic
> > shaping at the same time. There was once something like
> > wondershaper. Trick is to get the TCP queuing back inside your
> > router (that is where you deployed pppoe) as otherwise packets will
> > queue up in the modem (dsl modems use huge queues by default). This
> > works by lowering the uplink bandwith to 80-90% of measured maximum
> > upload (the excess bandwidth is for short bursts of traffic).
> > Traffic shaping now re-orders the packets. It should send ACK and
> > small packets first. This should solve your queuing problem.
>
>
> We're talking about optimizing the DSL connection at my office but the
> server is located in a data center.  I can't imagine optimizing that
> office DSL connection is the way to solve this even though the http
> response slowdowns do correlate to office hours.  As a note, the
> slowdowns are recorded by my third-party monitoring service.

Ah I didn't correctly get this... So as the problem correlates with
office hours the first step of solving your traffic flow problems
(timeouts, drops etc) should be sufficient to further work on problems
of the other side.


-- 
Regards,
Kai

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