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| author | Anton Blanchard <anton@samba.org> | 2014-09-16 10:49:14 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2014-09-25 23:14:49 +1000 |
| commit | 423216ed3273dae18c347ce52c5ecc193cfdd4e5 (patch) | |
| tree | 9f1f095dbd57904697dabd2c463e1decace2faa8 /arch/powerpc/kernel/idle_power7.S | |
| parent | ff2e466aa2339238c941dee873e553687e941f3f (diff) | |
| download | linux-next-423216ed3273dae18c347ce52c5ecc193cfdd4e5.tar.gz | |
powerpc: Use CONFIG_ARCH_HAS_FAST_MULTIPLIER
I ran some tests to compare hash_64 using shifts and multiplies.
The results:
POWER6: ~2x slower
POWER7: ~2x faster
POWER8: ~2x faster
Now we have a proper config option, select
CONFIG_ARCH_HAS_FAST_MULTIPLIER on POWER7 and POWER8.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/idle_power7.S')
0 files changed, 0 insertions, 0 deletions