From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Dave Taht <dave.taht@gmail.com>
Cc: "Paolo Valente" <paolo.valente@unimore.it>,
"Toke Høiland-Jørgensen" <toke@toke.dk>,
"codel@lists.bufferbloat.net" <codel@lists.bufferbloat.net>,
"cerowrt-devel@lists.bufferbloat.net"
<cerowrt-devel@lists.bufferbloat.net>,
bloat <bloat@lists.bufferbloat.net>,
"David Woodhouse" <dwmw2@infradead.org>,
"John Crispin" <blogic@openwrt.org>
Subject: Re: [Bloat] [Cerowrt-devel] FQ_Codel lwn draft article review
Date: Mon, 3 Dec 2012 07:03:31 -0800 [thread overview]
Message-ID: <20121203150331.GI2605@linux.vnet.ibm.com> (raw)
In-Reply-To: <CAA93jw7v53AgKF48=hu2HwvB8LZusz_FPczOutnVkDtGy+bRbg@mail.gmail.com>
On Mon, Dec 03, 2012 at 12:31:30PM +0100, Dave Taht wrote:
> On Mon, Dec 3, 2012 at 12:24 PM, Toke Høiland-Jørgensen <toke@toke.dk> wrote:
> > "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> writes:
> >
> >> And please see attached. Thoughts?
> >
> >"In addition, you network driver must be instrumented to support packet
> ^^^^ your ethernet network driver
Good catch, fixed!
Thanx, Paul
> different technologies have different answers. BQL is an answer to
> ethernet. ADSL benefits from closely tieing buffering to being nearly
> zero and to signalling the actual packet delivery from the hardware.
>
> Wifi, well, I don't want to talk about wifi...
>
> > scheduling..."
> >
> > So what happens if you run fq_codel on a non-BQL driver?
>
> you have no control. The tx queue rings are flooded before control is
> handed back to the fq_codel scheduler. You can get some control back
> on a non-BQL driver by reducing the number of tx descriptors
> dramatically, but that leads to issues with small vs big packets....
>
> Be worthwhile to plot BQL vs non-BQL on the same driver/device....
>
> >
> > -Toke
> >
> > --
> > Toke Høiland-Jørgensen
> > toke@toke.dk
>
>
>
> --
> Dave Täht
>
> Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html
>
next prev parent reply other threads:[~2012-12-03 15:03 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAA93jw5yFvrOyXu2s2DY3oK_0v3OaNfnL+1zTteJodfxtAAzcQ@mail.gmail.com>
2012-11-23 8:57 ` [Bloat] " Dave Taht
2012-11-23 22:18 ` Paul E. McKenney
2012-11-24 0:07 ` Toke Høiland-Jørgensen
2012-11-24 16:19 ` Dave Taht
2012-11-24 16:36 ` [Bloat] [Cerowrt-devel] " dpreed
2012-11-24 19:57 ` [Bloat] [Codel] " Andrew McGregor
2012-11-26 21:13 ` Rick Jones
2012-11-26 21:19 ` Dave Taht
2012-11-26 22:16 ` [Bloat] " Toke Høiland-Jørgensen
2012-11-26 23:21 ` Toke Høiland-Jørgensen
2012-11-26 23:39 ` [Bloat] [Cerowrt-devel] " dpreed
2012-11-26 23:58 ` Toke Høiland-Jørgensen
2012-11-27 16:41 ` Oliver Hohlfeld
2012-11-28 0:51 ` Toke Høiland-Jørgensen
2012-11-28 19:21 ` Greg White
2012-11-28 19:45 ` Simon Barber
2012-11-28 20:01 ` Oliver Hohlfeld
2012-11-28 21:40 ` Greg White
2012-11-28 20:09 ` Oliver Hohlfeld
2012-11-28 21:45 ` Greg White
2012-11-26 17:20 ` [Bloat] " Paul E. McKenney
2012-11-26 21:05 ` [Bloat] [Codel] " Rick Jones
2012-11-26 23:18 ` Rick Jones
2012-11-27 22:03 ` [Bloat] [Cerowrt-devel] " Jim Gettys
2012-11-27 22:31 ` David Lang
2012-11-27 22:54 ` Paul E. McKenney
2012-11-27 23:15 ` [Bloat] [Codel] " Andrew McGregor
2012-11-28 0:51 ` Paul E. McKenney
2012-11-28 17:36 ` Paul E. McKenney
2012-11-28 14:06 ` [Bloat] " Michael Richardson
2012-11-27 22:49 ` Paul E. McKenney
2012-11-27 23:53 ` [Bloat] [Codel] " Greg White
2012-11-28 0:27 ` Paul E. McKenney
2012-11-28 3:43 ` Kathleen Nichols
2012-11-28 4:38 ` Paul E. McKenney
2012-11-28 16:01 ` Paul E. McKenney
2012-11-28 16:16 ` Jonathan Morton
2012-11-28 17:44 ` Paul E. McKenney
2012-11-28 18:37 ` Michael Richardson
2012-11-28 18:51 ` Eric Dumazet
2012-11-28 21:44 ` Michael Richardson
2012-11-28 19:00 ` Eric Dumazet
[not found] ` <87vcckb0el.fsf@toke.dk>
2012-12-02 21:47 ` Andrew McGregor
2012-12-03 8:04 ` Dave Taht
2012-12-02 22:07 ` Eric Dumazet
[not found] ` <87lidgaynn.fsf@toke.dk>
2012-12-02 22:30 ` Eric Dumazet
2012-11-28 17:20 ` [Bloat] " Paul E. McKenney
[not found] ` <20121202230635.GA16359@linux.vnet.ibm.com>
[not found] ` <87obib5qf8.fsf@toke.dk>
2012-12-03 11:31 ` Dave Taht
[not found] ` <87fw3n5m9g.fsf@toke.dk>
2012-12-03 14:58 ` Paul E. McKenney
2012-12-03 15:49 ` [Bloat] [Codel] " Eric Dumazet
2012-12-03 15:03 ` Paul E. McKenney [this message]
2012-12-03 15:58 ` [Bloat] " David Woodhouse
2012-12-04 3:13 ` [Bloat] [Codel] " Dan Siemon
2012-12-04 9:23 ` Alex Burr
2012-12-05 3:41 ` Dan Siemon
2012-12-05 20:33 ` Alex Burr
2012-12-06 4:12 ` Dan Siemon
2012-12-06 23:41 ` Alex Burr
2012-12-05 0:01 ` Sebastian Moeller
2012-11-30 1:09 ` [Bloat] " Dan Siemon
2013-01-01 20:50 ` Dan Siemon
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