search for: power_saving

On a running system, I was just logging in, and it took for-bloody-ever. I run top, and ok, a load of 5 still shouldn't do that; we have folks that do put real loads on these systems. But top shows me power_saving frequently coming to the top, with a 94% - 100% CPU usage, and there's two threads of power_saving. Add to this that I don't *ever* remember seeing such a kernel thread. So, can I kill either or both threads? Googling some, I see someone suggesting: acpi_pad.disable=1 already added in grub...

Signed-off-by: Nicholas Piggin <npiggin at gmail.com> --- arch/powerpc/include/asm/paravirt.h | 23 ++++++++ arch/powerpc/include/asm/qspinlock.h | 55 +++++++++++++++++++ arch/powerpc/include/asm/qspinlock_paravirt.h | 5 ++ arch/powerpc/platforms/pseries/Kconfig | 5 ++ arch/powerpc/platforms/pseries/setup.c | 6 +- include/asm-generic/qspinlock.h

Signed-off-by: Nicholas Piggin <npiggin at gmail.com> --- arch/powerpc/include/asm/paravirt.h | 28 ++++++++++ arch/powerpc/include/asm/qspinlock.h | 55 +++++++++++++++++++ arch/powerpc/include/asm/qspinlock_paravirt.h | 5 ++ arch/powerpc/platforms/pseries/Kconfig | 5 ++ arch/powerpc/platforms/pseries/setup.c | 6 +- include/asm-generic/qspinlock.h

Signed-off-by: Nicholas Piggin <npiggin at gmail.com> --- arch/powerpc/include/asm/paravirt.h | 28 ++++++++ arch/powerpc/include/asm/qspinlock.h | 66 +++++++++++++++++++ arch/powerpc/include/asm/qspinlock_paravirt.h | 7 ++ arch/powerpc/platforms/pseries/Kconfig | 5 ++ arch/powerpc/platforms/pseries/setup.c | 6 +- include/asm-generic/qspinlock.h

Back in 2013, runtime PM for GPUs with integrated HDA controller was introduced with commits 0d69704ae348 ("gpu/vga_switcheroo: add driver control power feature. (v3)") and 246efa4a072f ("snd/hda: add runtime suspend/resume on optimus support (v4)"). Briefly, the idea was that the HDA controller is forced on and off in unison with the GPU. The original code is mostly still in

...truct acpi_mpst_component { + u16 component_id; +}; + +/* Memory Power State Characteristics Structure (follows all POWER_NODEs) */ + +struct acpi_mpst_data_hdr { + u16 characteristics_count; +}; + +struct acpi_mpst_power_data { + u8 revision; + u8 flags; + u16 reserved1; + u32 average_power; + u32 power_saving; + u64 exit_latency; + u64 reserved2; +}; + +/* Values for Flags field above */ + +#define ACPI_MPST_PRESERVE 1 +#define ACPI_MPST_AUTOENTRY 2 +#define ACPI_MPST_AUTOEXIT 4 + +/* Shared Memory Region (not part of an ACPI table) */ + +struct acpi_mpst_shared { +...

Hi, My X setup with nouveau fails for some time now. user at localhost ~ $ lspci -vknn ?01:00.0 VGA compatible controller [0300]: NVIDIA Corporation G72M [Quadro NVS 110M/GeForce Go 7300] [10de:01d7] (rev a1) (prog-if 00 [VGA controller]) ?? ?Subsystem: Toshiba America Info Systems Device [1179:ff02] ?? ?Flags: bus master, fast devsel, latency 0, IRQ 16 ?? ?Memory at dd000000 (32-bit,

On Sun, Feb 18, 2018 at 09:38:32AM +0100, Lukas Wunner wrote: > Back in 2013, runtime PM for GPUs with integrated HDA controller was > introduced with commits 0d69704ae348 ("gpu/vga_switcheroo: add driver > control power feature. (v3)") and 246efa4a072f ("snd/hda: add runtime > suspend/resume on optimus support (v4)"). > > Briefly, the idea was that the HDA

Hello, I was not happy with the power consumption of CentOS 6 x86_64 on a new Lenovo Thinkpad x220 Tablet and I worked on reducing it. I just wanted to share with the list one of the changes which gave me the most significant improvement. As per http://www.williambrownstreet.net/blog/?p=387, add the following kernel arguments to the GRUB boot configuration: pcie_aspm=force

...truct acpi_mpst_component { + u16 component_id; +}; + +/* Memory Power State Characteristics Structure (follows all POWER_NODEs) */ + +struct acpi_mpst_data_hdr { + u16 characteristics_count; +}; + +struct acpi_mpst_power_data { + u8 revision; + u8 flags; + u16 reserved1; + u32 average_power; + u32 power_saving; + u64 exit_latency; + u64 reserved2; +}; + +/* Values for Flags field above */ + +#define ACPI_MPST_PRESERVE 1 +#define ACPI_MPST_AUTOENTRY 2 +#define ACPI_MPST_AUTOEXIT 4 + +/* Shared Memory Region (not part of an ACPI table) */ + +struct acpi_mpst_shared { +...

Modernize vga_switcheroo by using a "device link" to enforce a runtime PM dependency from an HDA controller to the GPU it's integrated into. Remove thereby obsoleted code and fix a bunch of bugs. Device links were introduced in v4.10. Users might see a small power saving if the discrete GPU is in use and its HDA controller is not, because the HDA controller is now allowed to runtime

Modernize vga_switcheroo by using a device link to enforce a runtime PM dependency from an HDA controller to the GPU it's integrated into, v2. Changes since v1: - Replace patch [1/7] to use pci_save_state() / pci_restore_state() for consistency between runtime PM code path of bound and unbound devices. (Rafael, Bjorn) - Patch [5/7]: Drop an unnecessary initialization. (Bjorn) Rephrase

v2 is updated to account for feedback from Will, Peter, and Waiman (thank you), and trims off a couple of RFC and unrelated patches. Thanks, Nick Nicholas Piggin (6): powerpc/powernv: must include hvcall.h to get PAPR defines powerpc/pseries: move some PAPR paravirt functions to their own file powerpc: move spinlock implementation to simple_spinlock powerpc/64s: implement queued

Updated with everybody's feedback (thanks all), and more performance results. What I've found is I might have been measuring the worst load point for the paravirt case, and by looking at a range of loads it's clear that queued spinlocks are overall better even on PV, doubly so when you look at the generally much improved worst case latencies. I have defaulted it to N even though

This series adds an option to use queued spinlocks for powerpc, and makes it the default for the Book3S-64 subarch. This effort starts with the generic code so it's very simple but still very performant. There are optimisations that can be made to slowpaths, but I think it's better to attack those incrementally if/when we find things, and try to add the improvements to generic code as

v3 is updated to use __pv_queued_spin_unlock, noticed by Waiman (thank you). Thanks, Nick Nicholas Piggin (6): powerpc/powernv: must include hvcall.h to get PAPR defines powerpc/pseries: move some PAPR paravirt functions to their own file powerpc: move spinlock implementation to simple_spinlock powerpc/64s: implement queued spinlocks and rwlocks powerpc/pseries: implement paravirt

v3 is updated to use __pv_queued_spin_unlock, noticed by Waiman (thank you). Thanks, Nick Nicholas Piggin (6): powerpc/powernv: must include hvcall.h to get PAPR defines powerpc/pseries: move some PAPR paravirt functions to their own file powerpc: move spinlock implementation to simple_spinlock powerpc/64s: implement queued spinlocks and rwlocks powerpc/pseries: implement paravirt