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authorWanpeng Li <wanpengli@tencent.com>2020-03-26 10:20:02 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2020-03-26 05:58:26 -0400
commitd5361678e63c8a5e72d75cee6d15b840c44306f2 (patch)
treef7ff872c969cbe77c3c7e324302781097c0e3d5e /virt
parent8a1038de11a5536c76054061837b11648bec5b46 (diff)
downloadlinux-d5361678e63c8a5e72d75cee6d15b840c44306f2.tar.gz
KVM: X86: Micro-optimize IPI fastpath delay
This patch optimizes the virtual IPI fastpath emulation sequence: write ICR2 send virtual IPI read ICR2 write ICR2 send virtual IPI ==> write ICR write ICR We can observe ~0.67% performance improvement for IPI microbenchmark (https://lore.kernel.org/kvm/20171219085010.4081-1-ynorov@caviumnetworks.com/) on Skylake server. Signed-off-by: Wanpeng Li <wanpengli@tencent.com> Message-Id: <1585189202-1708-4-git-send-email-wanpengli@tencent.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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