v4.18-rc1 on droid 4: very bad CPU performance
From: Pavel Machek <hidden>
Date: 2018-07-04 20:22:15
Also in:
linux-omap, lkml
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 at 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 at devuan:~$ 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 at devuan:~$ droid 4. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 181 bytes Desc: Digital signature URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20180704/b53d01f6/attachment.sig>