为您找到"
Mwait
"相关结果约100,000,000个
MWAIT is a hint to the processor to enter an optimized state until a specified event or a store operation. It works with MONITOR instruction for address-range monitoring or power management. See CPUID, EAX, ECX, and C-states details.
Uses of monitor/mwait in the Linux kernel. The Linux kernel uses the monitor/mwait instructions in the idle loop, which is executed on a core when there is no runnable task (other than the idle task) that is scheduled to run on the core. These instructions are used in the idle loop on all Intel x86 processors, except in the following situations:
The MWAIT instruction can be executed at any privilege level. The MONITOR CPUID feature flag (ECX[bit 3] when CPUID is executed with EAX = 1) indicates the availability of the MONITOR and MWAIT instruction in a processor. When set, the unconditional execution of MWAIT is supported at privilege level 0 and conditional execution is supported at ...
Some of the MWAIT hint values allow the processor to use core C-states only (most importantly, that is the case for the MWAIT hint value corresponding to the C1 idle state), but the majority of them give it a license to put the target core (i.e. the core containing the logical CPU executing MWAIT with the given hint value) into a specific core ...
This repository contains the following materials: Intel-umwait: contains the code that test if umonitor/umwait work on the current processor.; trigger-tester: contains the code that we used to analyse the wakeup-trigger of all mwait-variants (Table 1-2).; timed_mwait_feat: contains the code that we reverse engineered the Intel's undocumented timed-mwait feature.
Disable EVC for the vCLS vm (this is temporary as EVC will actually then re-enable as Intel "Cascade Lake" Generation...for the purposes of satisfying the MWAIT error, this is an acceptable workaround). Another vCLS will power on the cluster note this. Repeat these steps for the remaining VCLS VMs until all 3 of them are powered on in the cluster
The Solaris OS uses the SSE3 MONITOR and MWAIT instructions in x86 processor idle loop. Using the SSE3 instructions in the processor idle loop eliminates the overhead of sending and receiving an interrupt to wake up a halted processor. MONITOR is used to specify a memory range to "monitor". MWAIT halts the processor until the address ...
The MONITOR instruction arms address monitoring hardware using an address specified in EAX (the address range that the monitoring hardware checks for store operations can be determined by using CPUID). A store to an address within the specified address range triggers the monitoring hardware. The state of monitor hardware is used by MWAIT.
If unarmed, MWAIT simply behaves as a NOP. Architecturally, both MONITOR and MWAIT are equivalent to a NOP instruction, and the monitoring hardware is invisible to the CPU programmer. MWAIT can be seen as a prolonged, low-power NOP instruction whose duration is determined by the above-mentioned "invisible" state in the CPU silicon.
The monitor instruction sets up hardware to detect changes in memory locations (typically in cache), while the mwait instruction puts a thread into low-power "sleep" until those memory changes are detected. The mwait only looks for changes that have been set up by the previous monitor instruction.