linux-kernel - Re: v4.18-rc1 on droid 4: very bad CPU performance

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Date:   Wed, 4 Jul 2018 22:22:07 +0200
From:   Pavel Machek <pavel@....cz>
To:     Tony Lindgren <tony@...mide.com>
Cc:     kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, sre@...nel.org, nekit1000@...il.com,
        mpartap@....net, merlijn@...zup.org
Subject: Re: v4.18-rc1 on droid 4: very bad CPU performance

Hi!

> OK. I checked and duovero runs only at 600MHz. I can only
> get down to 19 seconds with omap2plus_defconfig if I disable
> CONFIG_CPU_FREQ so the max speed is maintained from bootloader.
> Otherwise it runs at most at 1GHz, I think any higher speeds
> need smartreflex and voltage scaling working which we don't
> have in the mainline kernel. Not sure what happens with higher
> speeds with mainline kernel or if they are unsafe in the long
> run.
> 
> Anyways, care to post your .config somewhere so I can see what
> the numbers are for me with it?

After reboot (same config as in previous mail), before x / ofono /
unicsy_demo /... were started:

user@...uan:~$ uname -a
Linux devuan 4.18.0-rc3-88788-g528947b #758 SMP Wed Jul 4 10:05:21
CEST 2018 armv7l GNU/Linux
user@...uan:~$ time cat /dev/urandom | head -c 10000000 |  bzip2 -9 -
| wc -c
10044041
11.50user 0.37system 11.57 (0m11.570s) elapsed 102.63%CPU
user@...uan:~$

droid 4.

								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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