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

From: Pavel Machek
Date: Wed Jul 04 2018 - 16:22:15 EST


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

droid 4.


(cesky, pictures)

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