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00c25bce02
kernel-ark/arch/x86/kvm
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Rik van Riel 00c25bce02 KVM: VMX: increase ple_gap default to 128 
On some CPUs, a ple_gap of 41 is simply insufficient to ever trigger
PLE exits, even with the minimalistic PLE test from kvm-unit-tests.

http://git.kernel.org/?p=virt/kvm/kvm-unit-tests.git;a=commitdiff;h=eda71b28fa122203e316483b35f37aaacd42f545

For example, the Xeon X5670 CPU needs a ple_gap of at least 48 in
order to get pause loop exits:

# modprobe kvm_intel ple_gap=47
# taskset 1 /usr/local/bin/qemu-system-x86_64 \
  -device testdev,chardev=log -chardev stdio,id=log \
  -kernel x86/vmexit.flat -append ple-round-robin -smp 2
VNC server running on `::1:5900'
enabling apic
enabling apic
ple-round-robin 58298446
# rmmod kvm_intel
# modprobe kvm_intel ple_gap=48
# taskset 1 /usr/local/bin/qemu-system-x86_64 \
   -device testdev,chardev=log -chardev stdio,id=log \
   -kernel x86/vmexit.flat -append ple-round-robin -smp 2
VNC server running on `::1:5900'
enabling apic
enabling apic
ple-round-robin 36616

Increase the ple_gap to 128 to be on the safe side.

Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Zhai, Edwin <edwin.zhai@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2011-03-17 13:08:25 -03:00
..
emulate.c KVM: SVM: copy instruction bytes from VMCB 2011-01-12 11:31:07 +02:00
i8254.c KVM: fix typo in copyright notice 2010-10-24 10:53:14 +02:00
i8254.h KVM: x86: Introduce a workqueue to deliver PIT timer interrupts 2010-08-01 10:46:49 +03:00
i8259.c KVM: i8259: initialize isr_ack 2011-01-02 11:52:48 +02:00
irq.c KVM: fix typo in copyright notice 2010-10-24 10:53:14 +02:00
irq.h KVM: Convert PIC lock from raw spinlock to ordinary spinlock 2010-10-24 10:52:56 +02:00
Kconfig KVM: Halt vcpu if page it tries to access is swapped out 2011-01-12 11:21:39 +02:00
kvm_cache_regs.h KVM: Fetch guest cr3 from hardware on demand 2011-01-12 11:31:16 +02:00
kvm_timer.h KVM: arch/x86/kvm/kvm_timer.h checkpatch cleanup 2010-05-17 12:14:42 +03:00
lapic.c KVM: Avoid double interrupt injection with vapic 2011-01-12 11:23:36 +02:00
lapic.h
Makefile KVM: x86: Makefile clean up 2011-01-12 11:29:08 +02:00
mmu_audit.c KVM: MMU: audit: allow audit more guests at the same time 2011-01-12 11:31:17 +02:00
mmu.c KVM: MMU: Don't flush shadow when enabling dirty tracking 2011-03-17 13:08:24 -03:00
mmu.h KVM: MMU: Don't track nested fault info in error-code 2010-10-24 10:52:55 +02:00
mmutrace.h KVM: MMU: support disable/enable mmu audit dynamicly 2010-10-24 10:51:56 +02:00
paging_tmpl.h thp: kvm mmu transparent hugepage support 2011-01-13 17:32:41 -08:00
svm.c KVM: SVM: Add support for perf-kvm 2011-03-17 13:08:25 -03:00
timer.c KVM: fix typo in copyright notice 2010-10-24 10:53:14 +02:00
trace.h tracing: Fix event alignment: kvm:kvm_hv_hypercall 2011-03-10 10:34:24 -05:00
tss.h
vmx.c KVM: VMX: increase ple_gap default to 128 2011-03-17 13:08:25 -03:00
x86.c Merge branch 'kvm-updates/2.6.38' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2011-01-13 10:14:24 -08:00
x86.h KVM: SVM: Do not report xsave in supported cpuid 2010-12-08 17:28:37 +02:00