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x86: disable mwait for AMD family 10H/11H CPUs

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The previous revert of 0c07ee38c9 left
out the mwait disable condition for AMD family 10H/11H CPUs.

Andreas Herrman said:

It depends on the CPU. For AMD CPUs that support MWAIT this is wrong.
Family 0x10 and 0x11 CPUs will enter C1 on HLT. Powersavings then
depend on a clock divisor and current Pstate of the core.

If all cores of a processor are in halt state (C1) the processor can
enter the C1E (C1 enhanced) state. If mwait is used this will never
happen.

Thus HLT saves more power than MWAIT here.

It might be best to switch off the mwait flag for these AMD CPU
families like it was introduced with commit
f039b75471 (x86: Don't use MWAIT on AMD
Family 10)

Re-add the AMD families 10H/11H check and disable the mwait usage for
those.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2008-05-16 22:55:26 +02:00
parent 31f4d870b0
commit e9623b3559
1 changed files with 28 additions and 1 deletions
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29
arch/x86/kernel/process.c
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@ -110,6 +110,33 @@ static void poll_idle(void)
cpu_relax();
}
/*
* mwait selection logic:
*
* It depends on the CPU. For AMD CPUs that support MWAIT this is
* wrong. Family 0x10 and 0x11 CPUs will enter C1 on HLT. Powersavings
* then depend on a clock divisor and current Pstate of the core. If
* all cores of a processor are in halt state (C1) the processor can
* enter the C1E (C1 enhanced) state. If mwait is used this will never
* happen.
*
* idle=mwait overrides this decision and forces the usage of mwait.
*/
static int __cpuinit mwait_usable(const struct cpuinfo_x86 *c)
{
if (force_mwait)
return 1;
if (c->x86_vendor == X86_VENDOR_AMD) {
switch(c->x86) {
case 0x10:
case 0x11:
return 0;
}
}
return 1;
}
void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)
{
static int selected;
@ -122,7 +149,7 @@ void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)
" performance may degrade.\n");
}
#endif
if (cpu_has(c, X86_FEATURE_MWAIT)) {
if (cpu_has(c, X86_FEATURE_MWAIT) && mwait_usable(c)) {
/*
* Skip, if setup has overridden idle.
* One CPU supports mwait => All CPUs supports mwait