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KVM: x86: lower default for halt_poll_ns 

In some fio benchmarks, halt_poll_ns=400000 caused CPU utilization to
increase heavily even in cases where the performance improvement was
small.  In particular, bandwidth divided by CPU usage was as much as
60% lower.

To some extent this is the expected effect of the patch, and the
additional CPU utilization is only visible when running the
benchmarks.  However, halving the threshold also halves the extra
CPU utilization (from +30-130% to +20-70%) and has no negative
effect on performance.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Paolo Bonzini 2017-04-18 12:41:18 +02:00 committed by Radim Krčmář
parent 0780516a18
commit b401ee0b85
1 changed files with 1 additions and 1 deletions
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2
arch/x86/include/asm/kvm_host.h
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@ -43,7 +43,7 @@
#define KVM_PRIVATE_MEM_SLOTS 3
#define KVM_MEM_SLOTS_NUM (KVM_USER_MEM_SLOTS + KVM_PRIVATE_MEM_SLOTS)
#define KVM_HALT_POLL_NS_DEFAULT 400000
#define KVM_HALT_POLL_NS_DEFAULT 200000
#define KVM_IRQCHIP_NUM_PINS KVM_IOAPIC_NUM_PINS