Hi,
When booting v3.16-rc1 on OMAP1, I noticed strange slowness.
E.g. initramfs unpack takes several minutes. This was caused by default
cachepolicy getting changed from writethrough -> uncached for some reason:
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] Linux version 3.16.0-rc1-e3-los_880e+ (aaro@cooljazz) (gcc version 4.9.0 (GCC) ) #1 PREEMPT Thu Jun 19 22:51:42 EEST 2014
[ 0.000000] CPU: ARM925T [54029252] revision 2 (ARMv4T), cr=0000317f
[ 0.000000] CPU: VIVT data cache, VIVT instruction cache
[ 0.000000] Machine: Amstrad E3 (Delta)
[ 0.000000] Ignoring memory below PHYS_OFFSET: 0x02000000-0x10000000
[ 0.000000] bootconsole [earlycon0] enabled
[ 0.000000] Memory policy: Data cache uncached
[...]
[ 4.602732] Unpacking initramfs...
[ 425.125093] Freeing initrd memory: 3532K (c1c00000 - c1f73000)
It seems this is caused by commit:
commit ca8f0b0a545f55b3dc6877cda24d609a8979c951
Author: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Date: Tue May 27 20:34:28 2014 +0100
ARM: ensure C page table setup code follows assembly code
I can workaround this with "cachepolicy=writethrough" parameter.
A.
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