| Message ID | 20220819162547.141333-3-jeremy.linton@arm.com |
|---|---|
| State | New |
| Headers | show |
| Series | Disable FIE on machines with slow counters | expand |
On 8/19/22 17:25, Jeremy Linton wrote: > FIE is mostly implemented as PCC mailboxes on arm machines. This was > enabled by default without any data suggesting that it does anything > but hurt system performance. Lets change the default to 'n' until > hardware appears which clearly benefits. > > Signed-off-by: Jeremy Linton <jeremy.linton@arm.com> > --- > drivers/cpufreq/Kconfig.arm | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm > index 954749afb5fe..ad66d8f15db0 100644 > --- a/drivers/cpufreq/Kconfig.arm > +++ b/drivers/cpufreq/Kconfig.arm > @@ -22,7 +22,7 @@ config ACPI_CPPC_CPUFREQ > config ACPI_CPPC_CPUFREQ_FIE > bool "Frequency Invariance support for CPPC cpufreq driver" > depends on ACPI_CPPC_CPUFREQ && GENERIC_ARCH_TOPOLOGY > - default y > + default n > help > This extends frequency invariance support in the CPPC cpufreq driver, > by using CPPC delivered and reference performance counters. LGTM Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm index 954749afb5fe..ad66d8f15db0 100644 --- a/drivers/cpufreq/Kconfig.arm +++ b/drivers/cpufreq/Kconfig.arm @@ -22,7 +22,7 @@ config ACPI_CPPC_CPUFREQ config ACPI_CPPC_CPUFREQ_FIE bool "Frequency Invariance support for CPPC cpufreq driver" depends on ACPI_CPPC_CPUFREQ && GENERIC_ARCH_TOPOLOGY - default y + default n help This extends frequency invariance support in the CPPC cpufreq driver, by using CPPC delivered and reference performance counters.
FIE is mostly implemented as PCC mailboxes on arm machines. This was enabled by default without any data suggesting that it does anything but hurt system performance. Lets change the default to 'n' until hardware appears which clearly benefits. Signed-off-by: Jeremy Linton <jeremy.linton@arm.com> --- drivers/cpufreq/Kconfig.arm | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)