![]() In Linux systems the core C-states can be disabled using by modifying a boot time option and then using a bizarre interface. First, you need to disable the 'intel_idle' C-state governor by adding the boot option 'intel_idle.max_cstate=0' and rebooting the system. Second, you need to write a program that opens the file '/dev/cpu_dma_latency', writes a 32-bit binary value to the file, and then keeps the file open. If you close the file, the system reverts to the default behavior (which will allow all C-states). Sample routines for this purpose are provided at The value that you write is the maximum number of microseconds that the OS will allow for a processor to recover from a C-state. For the Xeon E5-2680 (Sandy Bridge) processors in my systems, the recovery times (also in microseconds) can be seen by $ cat /sys/devices/system/cpu/cpu0/cpuidle/state[01234]/latency 0 1 80 104 109 C0 has a 'recovery time' of 0 microseconds, since it is the active state. C1 has a recovery time of ~1 microsecond, but still saves a fair amount of power. + tristate 'Cpuidle Driver for Intel Processors'. +MODULE_DESCRIPTION('Cpuidle driver for Intel Hardware v' INTEL_IDLE_VERSION). We typically use 75 microseconds to prevent C-states with higher numbers than C1. Although I don't understand the details, there is not a 1:1 correspondence between the ACPI C-states used by the 'cpuidle' facility and the hardware C-states as actually implemented by the processor. You can certainly block all states with numbers higher than C1, but it is not clear whether this interface will allow control at finer granularity. My understanding is that the Intel idle driver can ignore BIOS and/or OS requests to not use the higher-numbered C-states. If you add the boot option 'intel_idle.max_cstate=0' it should cause the system to use the acpi idle driver instead of the Intel idle driver. It is not surprising that the two idle drivers show different states -- the Intel idle driver probably understands the hardware better than the ACPI idle driver. You might want to try the same tests without the special boot option and see if the system still obeys the /dev/cpu_dma_latency control. Ghost rider full movie in hindi free download hd avi. Watch Leanders letzte Reise 2017 Online Free: Leanders letzte Reise 2017 Leanders letzte Reise 2017 Full Movie Watch Online or Download instant free on your Desktop, Laptop, Notepad, Smart Phone, iPhone, Apple, All others. Pronographic Free Movie To Watch| Watch or download movies online. Find popular, top and now playing movies here. Watch movies with HD Quality. Watch or download the movies directly on your browser on PC, Tablet or Mobile. This list of Doraemon films features both feature length and short films based on the manga and anime series, Doraemon. Since 1980, all of these films to date have been. Deadpool 2 Full Movie Download In Hindi Torrent, watch movie online streaming HD for Free. Get access to more than 10 million Movies for FREE Deadpool 2 Full Movie Download In Hindi Torrent. ![]() If it works, then the whole process becomes much easier! Short Answer: Both are different implementations of CPU idle drivers. Acpi_idle is the default driver, supports all CPU architectures, while intel_idle is Intel CPUs specific. More details: The API for a CPU idle driver is defined in include/linux/cpuidle.h. Hai gaes slamat datang kembali:D lama gak posting, sibuk UAS soalnya. Kali ini gue bahas secara gue adalah penikmat musik. It defines the 'generic framework for CPU idle power management'. Acpi_idle driver (defined in drivers/acpi/processor_idle.c) implements this behaviour for all CPU architectures. Intel_idle (defined in drivers/idle/intel_idle.c) is an idle driver designed specifically for modern Intel CPUs (from the comments in the intel_idle.c header): /* * intel_idle.c - native hardware idle loop for modern Intel processors *. /* * intel_idle is a cpuidle driver that loads on specific Intel processors * in lieu of the legacy ACPI processor_idle driver. The intent is to * make Linux more efficient on these processors, as intel_idle knows * more than ACPI, as well as make Linux more immune to ACPI BIOS bugs. */ So for modern Intel CPUs you should use the intel_idle driver since it is designed specifically for increasing Intel CPUs' efficiency. So why would some setups load with intel_idle and some with acpi_idle?
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |