From: Eric Dumazet <eric.dumazet@gmail.com>
To: Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr>
Cc: bloat <bloat@lists.bufferbloat.net>
Subject: Re: [Bloat] AQM and PPP on Linux
Date: Tue, 28 Jul 2015 16:18:42 +0200 [thread overview]
Message-ID: <1438093122.20182.46.camel@edumazet-glaptop2.roam.corp.google.com> (raw)
In-Reply-To: <876154qtkt.wl-jch@pps.univ-paris-diderot.fr>
On Tue, 2015-07-28 at 15:50 +0200, Juliusz Chroboczek wrote:
> > What distro are you on?
>
> Debian. (One machine stable, one testing.)
>
> > There's a sysctl to set the default qdisc: net.core.default_qdisc.
>
> $ sysctl -a | grep default_qdisc
> net.core.default_qdisc = pfifo_fast
>
> > Set this to fq_codel and you should be good to go.
>
> Is that safe? I'm thinking lo and virtual interfaces.
Unless some user space script change it, virtual interfaces have
txqueuelen = 0, so no qdisc is set up on them
$ ifconfig lo | grep txqueuelen
collisions:0 txqueuelen:0
$ tc -s -d qdisc sh dev lo
<empty>
So yes, this is reasonably safe to change net.core.default_qdisc
next prev parent reply other threads:[~2015-07-28 14:18 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-28 13:09 Juliusz Chroboczek
2015-07-28 13:33 ` Toke Høiland-Jørgensen
2015-07-28 13:50 ` Juliusz Chroboczek
2015-07-28 14:05 ` Toke Høiland-Jørgensen
2015-07-28 14:11 ` Simon Barber
2015-07-28 14:21 ` Eric Dumazet
2015-07-28 14:31 ` Simon Barber
2015-07-28 14:43 ` Jonathan Morton
2015-07-28 14:49 ` Eric Dumazet
2015-07-28 14:55 ` Eric Dumazet
2015-07-28 16:02 ` Alan Jenkins
2015-07-28 16:22 ` Sebastian Moeller
2015-07-28 17:11 ` Michael Welzl
2015-07-29 7:19 ` David Lang
2015-07-28 19:20 ` Juliusz Chroboczek
2015-07-28 19:29 ` Alan Jenkins
2015-07-28 14:18 ` Eric Dumazet [this message]
2015-07-28 14:44 ` Dave Taht
2015-07-28 14:52 ` Eric Dumazet
2015-07-28 19:24 ` Juliusz Chroboczek
2015-07-28 19:31 ` Bill Ver Steeg (versteb)
2015-07-28 20:10 ` Alan Jenkins
2015-07-28 20:45 ` Alan Jenkins
2015-07-29 13:15 ` Stefan Alfredsson
2015-07-29 13:41 ` Dave Taht
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