From: Sebastian Moeller <moeller0@gmx.de>
To: Mikael Abrahamsson <swmike@swm.pp.se>
Cc: "Toke Høiland-Jørgensen" <toke@toke.dk>, bloat@lists.bufferbloat.net
Subject: Re: [Bloat] CAKE in openwrt high CPU
Date: Fri, 4 Sep 2020 16:12:35 +0200 [thread overview]
Message-ID: <518E1B74-2C17-4429-B1C8-3714E8CD2EFA@gmx.de> (raw)
In-Reply-To: <alpine.DEB.2.20.2009041530360.20021@uplift.swm.pp.se>
Hi Mikael,
Thanks! That looks like a fully saturated core, no? I do not know how to parse the symbols here, so not sure what "class" of load is denoted by the star, but I would guess something including sirqs? Anyway the average is ~49% load, while clearly CPU is pegged already. I assume the htop data is from the HGW...
best regards
Sebastian
> On Sep 4, 2020, at 15:37, Mikael Abrahamsson <swmike@swm.pp.se> wrote:
>
> On Thu, 3 Sep 2020, Sebastian Moeller wrote:
>
>> Mmmh, how did you measure the sirq percentage? Some top versions show overall percentage with 100% meaning all CPUs, so 35% in a quadcore could mean 1 fully maxed out CPU (25%) plus an additional 10% spread over the other three, or something more benign. Better top (so not busybox's) or htop versions also can show the load per CPU which is helpful to pinpoint hotspots...
>
> If I run iperf3 with 10 parallel sessions then htop shows this (in the CAKE upstream direction I believe):
>
> 1 [* 0.7%] Tasks: 19, 0 thr; 2 running
> 2 [*********************************************************************************100.0%] Load average: 0.48 0.16 0.05
> 3 [#*************************************** 44.4%] Uptime: 10 days, 04:46:37
> 4 [************************************************ 54.2%]
> Mem[|#* 36.7M/3.84G]
> Swp[ 0K/0K]
>
> The other direction (-R), typically this:
>
> 1 [#*********** 13.0%] Tasks: 19, 0 thr; 2 running
> 2 [*********************************************** 53.9%] Load average: 0.54 0.25 0.09
> 3 [#************************************************* 55.8%] Uptime: 10 days, 04:47:36
> 4 [************************************************************************** 84.4%]
>
> Topology is:
>
> PC - HGW -> Internet
>
> iperf3 is run on the PC, HGW has CAKE in the -> Internet direction.
>
>> Best Regards
>> Sebastian
>>
>>>
>>> root@OpenWrt:~# tc -s qdisc
>>> qdisc noqueue 0: dev lo root refcnt 2
>>> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>>> backlog 0b 0p requeues 0
>>> qdisc cake 8034: dev eth0 root refcnt 9 bandwidth 900Mbit diffserv3 triple-isolate nonat nowash no-ack-filter split-gso rtt 100.0ms raw overhead 0
>>> Sent 1111772001 bytes 959703 pkt (dropped 134, overlimits 221223 requeues 179)
>>> backlog 0b 0p requeues 179
>>> memory used: 2751976b of 15140Kb
>>> capacity estimate: 900Mbit
>>> min/max network layer size: 42 / 1514
>>> min/max overhead-adjusted size: 42 / 1514
>>> average network hdr offset: 14
>>>
>>> Bulk Best Effort Voice
>>> thresh 56250Kbit 900Mbit 225Mbit
>>> target 5.0ms 5.0ms 5.0ms
>>> interval 100.0ms 100.0ms 100.0ms
>>> pk_delay 0us 22us 232us
>>> av_delay 0us 6us 7us
>>> sp_delay 0us 4us 5us
>>> backlog 0b 0b 0b
>>> pkts 0 959747 90
>>> bytes 0 1111935437 39440
>>> way_inds 0 22964 0
>>> way_miss 0 275 2
>>> way_cols 0 0 0
>>> drops 0 134 0
>>> marks 0 0 0
>>> ack_drop 0 0 0
>>> sp_flows 0 3 1
>>> bk_flows 0 1 0
>>> un_flows 0 0 0
>>> max_len 0 68130 3714
>>> quantum 1514 1514 1514
>>>
>>>
>>> --
>>> Mikael Abrahamsson email: swmike@swm.pp.se_______________________________________________
>>> Bloat mailing list
>>> Bloat@lists.bufferbloat.net
>>> https://lists.bufferbloat.net/listinfo/bloat
>>
>
> --
> Mikael Abrahamsson email: swmike@swm.pp.se
next prev parent reply other threads:[~2020-09-04 14:12 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 [this message]
2020-09-01 15:41 ` Jonathan Foulkes
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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