From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.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>,
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 06:58:49 -0800 [thread overview]
Message-ID: <20121203145849.GH2605@linux.vnet.ibm.com> (raw)
In-Reply-To: <87fw3n5m9g.fsf@toke.dk>
On Mon, Dec 03, 2012 at 01:54:35PM +0100, Toke Høiland-Jørgensen wrote:
> Dave Taht <dave.taht@gmail.com> writes:
>
> > 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....
>
> Right, so BQL is pretty much a requirement to get anything worthwhile
> out of fq_codel? Or is that too strongly put?
If I understand the code correctly, without BQL, FQ-CoDel does not get
invoked at all.
Thanx, Paul
> Without BQL, exactly how much does the driver queue up? I've heard
> someone say 1000 packets for ethernet, but is that in a different
> context? E.g. pfifo_fast uses /sys/class/net/*/tx_queue_len for queue
> length (I think?), but if the qdisc doesn't, does the driver?
>
> -Toke
>
> --
> Toke Høiland-Jørgensen
> toke@toke.dk
next prev parent reply other threads:[~2012-12-03 15:08 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
2012-12-03 12:54 ` Toke Høiland-Jørgensen
2012-12-03 14:58 ` Paul E. McKenney [this message]
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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