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Date:   Tue, 09 Feb 2021 17:31:10 -0800
From:   nnet <nnet@fastmail.fm>
To:     =?UTF-8?Q?Marek_Beh=C3=BAn?= <kabel@kernel.org>
Cc:     =?UTF-8?Q?Pali_Roh=C3=A1r?= <pali@kernel.org>, a.heider@gmail.com,
        andrew@lunn.ch, gerald@gk2.net, gregory.clement@bootlin.com,
        kostap@marvell.com, linux-arm-kernel@lists.infradead.org,
        linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org,
        luka.perkov@sartura.hr, miquel.raynal@bootlin.com,
        mturquette@baylibre.com, rmk+kernel@armlinux.org.uk,
        sboyd@kernel.org, tmn505@gmail.com, vladimir.vid@sartura.hr
Subject: =?UTF-8?Q?Re:_[PATCH_mvebu_v2_00/10]_Armada_37xx:_Fix_cpufreq_changing_b?=
 =?UTF-8?Q?ase_CPU_speed_to_800_MHz_from_1000_MHz?=
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On Tue, Feb 9, 2021, at 3:26 PM, Marek Beh=C3=BAn wrote:
> On Tue, 09 Feb 2021 15:16:45 -0800
> nnet <nnet@fastmail.fm> wrote:
>=20
> > I've two of these and I've just swapped them (and re-pasted the heat=
 sinks).
> >=20
> > The second one ran under load for awhile and now has frozen as well.=

> >=20
> > Under a moderate load `wget -O /dev/null <large.bin>` @X00Mbits they=
 are fine.
> >=20
> > Under a 1 min speed test of load ~200Mbits routed WireGuard they fre=
eze.
> >=20
> > They fine with both those workloads @1000_800.
> >=20
> > Perhaps it's heat? Unfortunately I don't have any numbers on that AT=
M.
>=20
> Try disabling cpufreq in kernel completely, compile boot image at
> 1200 MHz. If it continues freezing, then I fear we can't help you with=

> 1200 MHz :(

cat /sys/devices/system/cpu/cpufreq/policy0/scaling_available_frequencie=
s=20
200000 300000 600000 1200000=20

I'm not getting any freezes with 1.2GHz fixed after 20 minutes of load:

echo 1200000 > /sys/devices/system/cpu/cpufreq/policy0/scaling_min_freq

Setting it back to min 200MHz I get a freeze within a minute:

echo 200000 > /sys/devices/system/cpu/cpufreq/policy0/scaling_min_freq

> Marek
>