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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
> 


  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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