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enable kvm_pv_eoi cpuflag

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Paravirtualized End-of-Interrupt Indication (PV-EOI)
Hosts and guests require two VM exits (context switches from a VM to a Hypervisor) for each interrupt:
one to inject the interrupt, and another to signal the end of the interrupt.

With pv_eoi , they can negotiate a paravirtualized end-of-interrupt feature and only require one switch per interrupt.
Number of exits is reduced by half for interrupt-intensive workloads,
such as incoming network traffic with a virtio network device.
This leads to significant reduction in host CPU utilization for such workloads.

Signed-off-by: Alexandre Derumier <aderumier@odiso.com>
This commit is contained in:
Alexandre Derumier 2015-03-16 05:57:46 +01:00 committed by Dietmar Maurer
parent 117a041466
commit 0da5a08cb4
1 changed files with 1 additions and 0 deletions
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PVE/QemuServer.pm
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@ -2912,6 +2912,7 @@ sub config_to_command {
if (qemu_machine_feature_enabled ($machine_type, $kvmver, 2, 3)) {
push @$cpuFlags , '+kvm_pv_unhalt' if !$nokvm;
push @$cpuFlags , '+kvm_pv_eoi' if !$nokvm;
}
$cpu .= "," . join(',', @$cpuFlags) if scalar(@$cpuFlags);