older performance measurements indicated that 50000 vs 80000 reduces cpu consumption while still providing the benefit of halt polling. We had this change in the IBM KVM product, but it got lost so it never went upstream. Recent re-measurement indicate that 50k is still better than 80k. Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx> --- arch/s390/include/asm/kvm_host.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index dbe254847e0d..cb63cc7bbf06 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -36,7 +36,7 @@ */ #define KVM_NR_IRQCHIPS 1 #define KVM_IRQCHIP_NUM_PINS 4096 -#define KVM_HALT_POLL_NS_DEFAULT 80000 +#define KVM_HALT_POLL_NS_DEFAULT 50000 /* s390-specific vcpu->requests bit members */ #define KVM_REQ_ENABLE_IBS KVM_ARCH_REQ(0) -- 2.19.1
