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| author | Rik van Riel <riel@redhat.com> | 2011-01-04 09:51:33 -0500 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2011-03-17 13:08:25 -0300 |
| commit | 00c25bce02fde63eaa1227532cff9ac7b71de79e (patch) | |
| tree | bf04cb749e0ff1913cffe8aa13af9794116b5e44 /Documentation/cpuidle | |
| parent | 3781c01c1574a2cd58fd5ba2bf58c710edff3da5 (diff) | |
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>
Diffstat (limited to 'Documentation/cpuidle')
0 files changed, 0 insertions, 0 deletions