From: Dave Taht <dave.taht@gmail.com>
To: "Toke Høiland-Jørgensen" <toke@toke.dk>
Cc: Paolo Valente <paolo.valente@unimore.it>,
Eric Raymond <esr@thyrsus.com>,
"codel@lists.bufferbloat.net" <codel@lists.bufferbloat.net>,
"cerowrt-devel@lists.bufferbloat.net"
<cerowrt-devel@lists.bufferbloat.net>,
bloat <bloat@lists.bufferbloat.net>,
paulmck@linux.vnet.ibm.com, David Woodhouse <dwmw2@infradead.org>,
John Crispin <blogic@openwrt.org>
Subject: Re: [Cerowrt-devel] FQ_Codel lwn draft article review
Date: Mon, 3 Dec 2012 12:31:30 +0100 [thread overview]
Message-ID: <CAA93jw7v53AgKF48=hu2HwvB8LZusz_FPczOutnVkDtGy+bRbg@mail.gmail.com> (raw)
In-Reply-To: <87obib5qf8.fsf@toke.dk>
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
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 11:31 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAA93jw5yFvrOyXu2s2DY3oK_0v3OaNfnL+1zTteJodfxtAAzcQ@mail.gmail.com>
2012-11-23 8:57 ` 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 ` dpreed
2012-11-24 19:57 ` [Cerowrt-devel] [Codel] " Andrew McGregor
2012-11-26 21:13 ` Rick Jones
2012-11-26 21:19 ` Dave Taht
2012-11-26 22:16 ` [Cerowrt-devel] " Toke Høiland-Jørgensen
2012-11-26 23:21 ` Toke Høiland-Jørgensen
2012-11-26 23:39 ` dpreed
2012-11-26 23:58 ` Toke Høiland-Jørgensen
2012-11-26 17:20 ` Paul E. McKenney
2012-11-26 21:05 ` [Cerowrt-devel] [Codel] " Rick Jones
2012-11-26 23:18 ` [Cerowrt-devel] [Bloat] " Rick Jones
2012-11-27 22:03 ` [Cerowrt-devel] " Jim Gettys
2012-11-27 22:31 ` [Cerowrt-devel] [Bloat] " David Lang
2012-11-27 22:54 ` Paul E. McKenney
2012-11-27 23:15 ` [Cerowrt-devel] [Codel] " Andrew McGregor
2012-11-28 0:51 ` Paul E. McKenney
2012-11-28 17:36 ` Paul E. McKenney
2012-11-28 14:06 ` [Cerowrt-devel] " Michael Richardson
2012-11-27 22:49 ` [Cerowrt-devel] " Paul E. McKenney
2012-11-27 23:53 ` [Cerowrt-devel] [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 ` [Cerowrt-devel] [Bloat] " Michael Richardson
2012-11-28 18:51 ` [Cerowrt-devel] [Codel] [Bloat] " Eric Dumazet
2012-11-28 21:44 ` Michael Richardson
2012-11-28 19:00 ` [Cerowrt-devel] [Bloat] [Codel] " Eric Dumazet
2012-12-02 21:37 ` Toke Høiland-Jørgensen
2012-12-02 21:47 ` [Cerowrt-devel] [Codel] [Bloat] " Andrew McGregor
2012-12-03 8:04 ` [Cerowrt-devel] [Bloat] [Codel] " Dave Taht
2012-12-02 22:07 ` Eric Dumazet
2012-12-02 22:15 ` Toke Høiland-Jørgensen
2012-12-02 22:30 ` Eric Dumazet
2012-12-02 22:51 ` Toke Høiland-Jørgensen
2012-11-28 17:20 ` [Cerowrt-devel] " Paul E. McKenney
2012-12-02 23:06 ` Paul E. McKenney
2012-12-03 11:24 ` Toke Høiland-Jørgensen
2012-12-03 11:31 ` Dave Taht [this message]
2012-12-03 12:54 ` Toke Høiland-Jørgensen
2012-12-03 14:58 ` Paul E. McKenney
2012-12-03 15:19 ` Toke Høiland-Jørgensen
2012-12-03 15:49 ` [Cerowrt-devel] [Codel] " Eric Dumazet
2012-12-03 15:03 ` [Cerowrt-devel] " Paul E. McKenney
2012-12-03 15:58 ` David Woodhouse
2012-12-04 3:13 ` [Cerowrt-devel] [Codel] " Dan Siemon
2012-12-04 9:23 ` [Cerowrt-devel] [Bloat] " Alex Burr
2012-12-05 3:41 ` Dan Siemon
[not found] ` <1354739624.4431.YahooMailNeo@web126205.mail.ne1.yahoo.com>
2012-12-06 4:12 ` Dan Siemon
2012-12-05 0:01 ` [Cerowrt-devel] " Sebastian Moeller
2012-11-30 1:09 ` [Cerowrt-devel] [Bloat] " Dan Siemon
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