linux-kernel - Re: [PATCH mvebu v2 00/10] Armada 37xx: Fix cpufreq changing base CPU speed to 800 MHz from 1000 MHz

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Date:   Tue, 09 Feb 2021 15:16:45 -0800
From:   nnet <nnet@...tmail.fm>
To:     Pali Rohár <pali@...nel.org>
Cc:     a.heider@...il.com, andrew@...n.ch, gerald@....net,
        gregory.clement@...tlin.com, kabel@...nel.org, kostap@...vell.com,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, luka.perkov@...tura.hr,
        miquel.raynal@...tlin.com, mturquette@...libre.com,
        rmk+kernel@...linux.org.uk, sboyd@...nel.org, tmn505@...il.com,
        vladimir.vid@...tura.hr
Subject: Re: [PATCH mvebu v2 00/10] Armada 37xx: Fix cpufreq changing base CPU speed to 800 MHz from 1000 MHz

I've two of these and I've just swapped them (and re-pasted the heat sinks).

The second one ran under load for awhile and now has frozen as well.

Under a moderate load `wget -O /dev/null <large.bin>` @X00Mbits they are fine.

Under a 1 min speed test of load ~200Mbits routed WireGuard they freeze.

They fine with both those workloads @1000_800.

Perhaps it's heat? Unfortunately I don't have any numbers on that ATM.

On Tue, Feb 9, 2021, at 2:56 PM, Pali Rohár wrote:
> On Tuesday 09 February 2021 14:52:56 nnet wrote:
> > On Tue, Feb 9, 2021, at 2:42 PM, Pali Rohár wrote:
> > > On Tuesday 09 February 2021 13:45:08 nnet wrote:
> > > > On Tue, Feb 9, 2021, at 1:33 PM, Pali Rohár wrote:
> > > > > On Tuesday 09 February 2021 13:00:26 nnet wrote:
> > > > > > > If you have other Armada 3720 boards (Espressobin v5/v7, uDPU, Devel Board, ...) then it will be nice to do an additional tests and check if instability issues are finally fixed.
> > > > > > 
> > > > > > These patches applied to the 5.4.96 in OpenWrt (98d61b5) work fine so far on an Espressobin v7 AFAICT per changing values in /sys/devices/system/cpu/cpufreq/policy0.
> > > > > > 
> > > > > > Are these changes intended to work @1.2 GHz on the v7?
> > > > > 
> > > > > Hello! Do you have 1.2 GHz A3720 SoC?
> > > > 
> > > > Maybe (not)? ESPRESSObin_V7_1-0 on the underside.
> > > 
> > > Look at the package of SoC chip. On top of the package is printed
> > > identifier 88F3720. On the last line should be one of the string:
> > > C080, C100, C120, I080, I100 which identifies frequency
> > > (080 = 800 MHz, 100 = 1 GHz, 120 = 1.2 GHz)
> > > 
> > > Can you check what is printed on A3720 SoC package?
> > 
> > Both of mine are 88F3720-A0-C120.
> 
> Interesting... it is really 1.2 GHz. I have not seen it yet. And few
> weeks ago I thought that it was never available on market.
> 
> Well, if 1.2 GHz variant has same issues as 1 GHz variants then this
> patch series should fix it. But you said that with this patch series is
> board crashing when running at 1.2 GHz?
>