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| author | Olof Johansson <olof@lixom.net> | 2006-10-04 23:41:41 -0500 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-10-16 16:32:25 +1000 |
| commit | 5b43d20a4d12d94f258bbbca5fa4df8ff8a17848 (patch) | |
| tree | 83b72628e99850fde1a49c435cbeee6e5750f942 /arch/powerpc/kernel/cputable.c | |
| parent | d04c56f73c30a5e593202ecfcf25ed43d42363a2 (diff) | |
| download | blackbird-op-linux-5b43d20a4d12d94f258bbbca5fa4df8ff8a17848.tar.gz blackbird-op-linux-5b43d20a4d12d94f258bbbca5fa4df8ff8a17848.zip | |
[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/kernel/cputable.c')
| -rw-r--r-- | arch/powerpc/kernel/cputable.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c index 95382f994404..f02b402c66d9 100644 --- a/arch/powerpc/kernel/cputable.c +++ b/arch/powerpc/kernel/cputable.c @@ -41,6 +41,7 @@ extern void __setup_cpu_745x(unsigned long offset, struct cpu_spec* spec); #endif /* CONFIG_PPC32 */ #ifdef CONFIG_PPC64 extern void __setup_cpu_ppc970(unsigned long offset, struct cpu_spec* spec); +extern void __setup_cpu_ppc970MP(unsigned long offset, struct cpu_spec* spec); extern void __restore_cpu_ppc970(void); #endif /* CONFIG_PPC64 */ @@ -221,7 +222,7 @@ struct cpu_spec cpu_specs[] = { .icache_bsize = 128, .dcache_bsize = 128, .num_pmcs = 8, - .cpu_setup = __setup_cpu_ppc970, + .cpu_setup = __setup_cpu_ppc970MP, .cpu_restore = __restore_cpu_ppc970, .oprofile_cpu_type = "ppc64/970", .oprofile_type = PPC_OPROFILE_POWER4, |
