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author | Olof Johansson <olof@lixom.net> | 2006-10-04 23:41:41 -0500 |
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committer | Paul Mackerras <paulus@samba.org> | 2006-10-16 16:32:25 +1000 |
commit | 5b43d20a4d12d94f258bbbca5fa4df8ff8a17848 (patch) | |
tree | 83b72628e99850fde1a49c435cbeee6e5750f942 /arch/powerpc/sysdev/Makefile | |
parent | d04c56f73c30a5e593202ecfcf25ed43d42363a2 (diff) | |
download | op-kernel-dev-5b43d20a4d12d94f258bbbca5fa4df8ff8a17848.zip op-kernel-dev-5b43d20a4d12d94f258bbbca5fa4df8ff8a17848.tar.gz |
[POWERPC] powerpc: Enable DEEPNAP power savings mode on 970MP
Without this patch, on an idle system I get:
cpu-power-0:21.638
cpu-power-1:27.102
cpu-power-2:29.343
cpu-power-3:25.784
Total: 103.8W
With this patch:
cpu-power-0:11.730
cpu-power-1:17.185
cpu-power-2:18.547
cpu-power-3:17.528
Total: 65.0W
If I lower HZ to 100, I can get it as low as:
cpu-power-0:10.938
cpu-power-1:16.021
cpu-power-2:17.245
cpu-power-3:16.145
Total: 60.2W
Another (older) Quad G5 went from 54W to 39W at HZ=250.
Coming back out of Deep Nap takes 40-70 cycles longer than coming back
from just Nap (which already takes quite a while). I don't think it'll
be a performance issue (interrupt latency on an idle system), but in
case someone does measurements feel free to report them.
Signed-off-by: Olof Johansson <olof@lixom.net>
Acked-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/sysdev/Makefile')
0 files changed, 0 insertions, 0 deletions