Cake - FQ_codel the next generation
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From: Jonathan Morton <chromatix99@gmail.com>
To: Dave Taht <dave.taht@gmail.com>
Cc: cake@lists.bufferbloat.net
Subject: Re: [Cake] cake for net-next 4.8
Date: Tue, 27 Sep 2016 20:52:27 +0300	[thread overview]
Message-ID: <32E6B0A0-6014-4510-9D97-02645F0EFDFD@gmail.com> (raw)
In-Reply-To: <CAA93jw5KAYKQqTmOw3=4tVcvUxT_DFkJmv9ZZ5xGMW7JVR+=dQ@mail.gmail.com>


> On 25 Sep, 2016, at 21:30, Dave Taht <dave.taht@gmail.com> wrote:
> 
> Judging from me tearing apart how TCP BBR works (presently) with ecn,
> it looks like we need to add the equivalent to fq_codel ce_threshold
> behaviors as well.

If I’m reading the legend correctly, you are setting ce_threshold to 1ms to get the better-controlled result.  But that effectively disables the codel algorithm and turns it into a simple “mark all packets over 1ms sojourn” for ECN capable traffic, because it’s a tighter limit than codel’s target.  That’s too aggressive for non-BBR traffic.

In these cases, I think you have to relax and let the FQ action take care of it.

 - Jonathan Morton


  parent reply	other threads:[~2016-09-27 17:52 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-25 18:30 Dave Taht
2016-09-27 14:38 ` Jonathan Morton
2016-09-27 16:04   ` Dave Taht
2016-09-27 16:13     ` Jonathan Morton
2016-09-29 23:22       ` Neil Shepperd
2016-09-30  8:02         ` Toke Høiland-Jørgensen
2016-09-30 13:08           ` Neil Shepperd
2016-09-30 19:42           ` Dave Täht
2016-09-30 20:37             ` Neil Shepperd
2016-09-30 21:10               ` Dave Täht
2016-10-03 21:17                 ` Neil Shepperd
2016-10-04  6:33                   ` Henning Rogge
2016-10-04 16:09                   ` Dave Täht
2016-10-20  5:56                     ` Neil Shepperd
2016-09-27 17:52 ` Jonathan Morton [this message]
2016-09-27 18:18   ` Dave Taht
2016-09-27 18:56     ` Jonathan Morton
2016-09-27 19:29       ` Dave Taht
2016-09-27 19:54         ` Jonathan Morton
2016-09-28 23:26       ` Dave Taht
2016-09-28 23:34         ` Jonathan Morton
2016-09-29 20:43           ` Andrew Shewmaker

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