From: Jonathan Foulkes <jf@jonathanfoulkes.com>
To: "Toke Høiland-Jørgensen" <toke@toke.dk>
Cc: Mikael Abrahamsson <swmike@swm.pp.se>, bloat@lists.bufferbloat.net
Subject: Re: [Bloat] CAKE in openwrt high CPU
Date: Tue, 1 Sep 2020 11:41:47 -0400 [thread overview]
Message-ID: <5DBFB383-13E8-4587-BE49-1767471D7D59@jonathanfoulkes.com> (raw)
In-Reply-To: <87mu2bjbf8.fsf@toke.dk>
Toke, that link returns a 404 for me.
For others, I’ve found that testing cake throughput with isolation options enabled is tricky if there are many competing connections.
Like I keep having to tell my customers, fairness algorithms mean no one device will ever gain 100% of the bandwidth so long as there are other open & active connections from other devices.
That said, I’d love to find options to increase throughput for single-tin configs.
Cheers,
Jonathan
> On Aug 31, 2020, at 7:35 AM, Toke Høiland-Jørgensen via Bloat <bloat@lists.bufferbloat.net> wrote:
>
> Mikael Abrahamsson via Bloat <bloat@lists.bufferbloat.net> writes:
>
>> Hi,
>>
>> I migrated to an APU2 (https://www.pcengines.ch/apu2.htm) as residential
>> router, from my previous WRT1200AC (marvell armada 385).
>>
>> I was running OpenWrt 18.06 on that one, now I am running latest 19.07.3
>> on the APU2.
>>
>> Before I had 500/100 and I had to use FQ_CODEL because CAKE took too much
>> CPU to be able to do 500/100 on the WRT1200AC. Now I upgraded to 1000/1000
>> and tried it again, and even the APU2 can only do CAKE up to ~300
>> megabit/s. With FQ_CODEL I get full speed (configure 900/900 in SQM in
>> OpenWrt).
>>
>> Looking in top, I see sirq% sitting at 50% pegged. This is typical what I
>> see when CPU based forwarding is maxed out. From my recollection of
>> running CAKE on earlier versions of openwrt (17.x) I don't remember CAKE
>> using more CPU than FQ_CODEL.
>>
>> Anyone know what's up? I'm fine running FQ_CODEL, it solves any
>> bufferbloat but... I thought CAKE supposedly should use less CPU, not
>> more?
>
> 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).
>
> If you are indeed not shaping, maybe you're hitting the issue fixed by this commit?
>
> https://github.com/dtaht/sch_cake/commit/3152477235c934022049fcddc063c45d37ec10e6n
>
> -Toke
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next prev parent reply other threads:[~2020-09-01 15:41 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-30 17:27 Mikael Abrahamsson
2020-08-30 17:52 ` Dave Taht
2020-08-31 11:35 ` Toke Høiland-Jørgensen
2020-08-31 12:22 ` Mikael Abrahamsson
2020-08-31 13:29 ` Toke Høiland-Jørgensen
2020-09-03 13:10 ` Mikael Abrahamsson
2020-09-03 13:29 ` Toke Høiland-Jørgensen
2020-09-03 13:34 ` Sebastian Moeller
2020-09-03 13:32 ` Sebastian Moeller
2020-09-04 13:37 ` Mikael Abrahamsson
2020-09-04 14:12 ` Sebastian Moeller
2020-09-01 15:41 ` Jonathan Foulkes [this message]
2020-09-01 16:11 ` Toke Høiland-Jørgensen
2020-09-01 16:25 ` Sebastian Moeller
2020-09-01 18:45 ` Toke Høiland-Jørgensen
2020-09-01 19:05 ` Jonathan Morton
2020-09-01 21:09 ` Toke Høiland-Jørgensen
2020-09-01 19:01 ` Jonathan Foulkes
2020-09-01 21:11 ` Toke Høiland-Jørgensen
2020-09-02 20:26 ` Jonathan Foulkes
2020-09-02 20:57 ` Toke Høiland-Jørgensen
2020-09-03 13:19 ` Mikael Abrahamsson
2020-09-03 13:27 ` Luca Muscariello
2020-09-03 14:32 ` Toke Høiland-Jørgensen
2020-09-03 15:31 ` Luca Muscariello
2020-09-03 18:39 ` Toke Høiland-Jørgensen
2020-09-03 18:53 ` Jonathan Morton
2020-09-03 22:14 ` [Bloat] Other CAKE territory (was: CAKE in openwrt high CPU) David Collier-Brown
2020-09-04 1:19 ` Jonathan Morton
2020-09-04 13:41 ` Mikael Abrahamsson
2020-09-04 11:11 ` Toke Høiland-Jørgensen
2020-09-03 13:27 ` [Bloat] CAKE in openwrt high CPU Toke Høiland-Jørgensen
2020-09-01 16:18 ` Sebastian Moeller
2020-09-01 19:31 ` Jonathan Foulkes
2020-09-01 20:04 ` Sebastian Moeller
2020-09-01 20:09 ` Jonathan Morton
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