From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <toke@toke.dk>
Received: from mail.toke.dk (mail.toke.dk [45.145.95.4])
 (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits))
 (No client certificate requested)
 by lists.bufferbloat.net (Postfix) with ESMTPS id BB2893B29E
 for <bloat@lists.bufferbloat.net>; Mon, 31 Aug 2020 09:29:37 -0400 (EDT)
From: Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= <toke@toke.dk>
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=toke.dk; s=20161023;
 t=1598880574; bh=9OjXEwvMlD/Nvze1vXUm6GIPAnDUomyARSULUrImZxw=;
 h=From:To:Cc:Subject:In-Reply-To:References:Date:From;
 b=uZVjac5mreXNoZBemzRF2yWYTPYzeG8EslpHBwlpx4Do3Cqz9ERaaf3gIokLbgTQL
 mbF5qBtwxRZHLLlb+91a7UM/I6pCDHQEmqglrebnNb2U6fyLUqxHjx6BVSj3GLwjJ1
 r0E4RJSWFnEl+1Mt91Onty0i8g6s49szkImYf+g93BI1Pc7TDf/NvKIRt+r7tsJCZJ
 jrAifiLm4BhFHvJtfiEZZyUqMZ/oGQqm9HxAdkZWucME5J/Mlf/N+4W7UgKHlv7nYl
 /+3R5WNSGJYREj1qU2fwH31Oua1qLXMhPsQ/U4gTX6ZsmIpunan8AfBO56RrFmlyog
 j7/XoP/nExESQ==
To: Mikael Abrahamsson <swmike@swm.pp.se>
Cc: bloat@lists.bufferbloat.net
In-Reply-To: <alpine.DEB.2.20.2008311415070.11025@uplift.swm.pp.se>
References: <alpine.DEB.2.20.2008301921450.11025@uplift.swm.pp.se>
 <87mu2bjbf8.fsf@toke.dk>
 <alpine.DEB.2.20.2008311415070.11025@uplift.swm.pp.se>
Date: Mon, 31 Aug 2020 15:29:33 +0200
X-Clacks-Overhead: GNU Terry Pratchett
Message-ID: <87eennj64i.fsf@toke.dk>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Subject: Re: [Bloat] CAKE in openwrt high CPU
X-BeenThere: bloat@lists.bufferbloat.net
X-Mailman-Version: 2.1.20
Precedence: list
List-Id: General list for discussing Bufferbloat <bloat.lists.bufferbloat.net>
List-Unsubscribe: <https://lists.bufferbloat.net/options/bloat>,
 <mailto:bloat-request@lists.bufferbloat.net?subject=unsubscribe>
List-Archive: <https://lists.bufferbloat.net/pipermail/bloat>
List-Post: <mailto:bloat@lists.bufferbloat.net>
List-Help: <mailto:bloat-request@lists.bufferbloat.net?subject=help>
List-Subscribe: <https://lists.bufferbloat.net/listinfo/bloat>,
 <mailto:bloat-request@lists.bufferbloat.net?subject=subscribe>
X-List-Received-Date: Mon, 31 Aug 2020 13:29:37 -0000

Mikael Abrahamsson <swmike@swm.pp.se> writes:

> On Mon, 31 Aug 2020, Toke H=C3=B8iland-J=C3=B8rgensen wrote:
>
>> Hmm, you say CAKE and FQ-Codel - so you're not enabling the shaper (that
>> would be FQ-CoDel+HTB)? An exact config might be useful (or just the
>> output of tc -s qdisc).
>
> Yeah, I guess I'm also using HTB to get the 900 megabit/s SQM is looking=
=20
> for.

Ah, right, makes more sense :)

> If I only use FQ_CODEL to get interface speeds my performance is fine.

And what about when you're running CAKE in 'unlimited' mode?

>> If you are indeed not shaping, maybe you're hitting the issue fixed by t=
his commit?
>>
>> https://github.com/dtaht/sch_cake/commit/3152477235c934022049fcddc063c45=
d37ec10e6n
>
> I enabled it just now to get the config.
>
> qdisc cake 8030: dev eth0 root refcnt 9 bandwidth 900Mbit besteffort=20
> triple-isolate nonat nowash no-ack-filter split-gso rtt 100.0ms raw=20
> overhead 0

Hmm, right, you could try no-split-gso as an option as well; you're
pretty close to the point where we turn it off by default, and you're
getting pretty large packets (max_len), so your performance may be
suffering from the splitting...

-Toke