[-v2] vmx: increase ple_gap default to 64

Commit Message

Rik van Riel Jan. 4, 2011, 2:51 p.m. UTC

None

Patch

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 81fcbe9..c61fcbf 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -90,14 +90,14 @@  module_param(vmm_exclusive, bool, S_IRUGO);
  * These 2 parameters are used to config the controls for Pause-Loop Exiting:
  * ple_gap:    upper bound on the amount of time between two successive
  *             executions of PAUSE in a loop. Also indicate if ple enabled.
- *             According to test, this time is usually small than 41 cycles.
+ *             According to test, this time is usually smaller than 128 cycles.
  * ple_window: upper bound on the amount of time a guest is allowed to execute
  *             in a PAUSE loop. Tests indicate that most spinlocks are held for
  *             less than 2^12 cycles
  * Time is measured based on a counter that runs at the same rate as the TSC,
  * refer SDM volume 3b section 21.6.13 & 22.1.3.
  */
-#define KVM_VMX_DEFAULT_PLE_GAP    41
+#define KVM_VMX_DEFAULT_PLE_GAP    128
 #define KVM_VMX_DEFAULT_PLE_WINDOW 4096
 static int ple_gap = KVM_VMX_DEFAULT_PLE_GAP;
 module_param(ple_gap, int, S_IRUGO);