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| author | Wanpeng Li <[email protected]> | 2020-04-10 10:47:03 -0700 |
|---|---|---|
| committer | Paolo Bonzini <[email protected]> | 2020-04-21 09:13:10 -0400 |
| commit | a9ab13ff6e844ad5b3ed39339e6db9a76bb539ad (patch) | |
| tree | baeae7a8f3432482d785309797a7124a3c6da7aa /tools/perf/scripts/python/bin/stackcollapse-report | |
| parent | 873e1da16918a83cc7440e299dda0dc7ab6db34c (diff) | |
KVM: X86: Improve latency for single target IPI fastpath
IPI and Timer cause the main MSRs write vmexits in cloud environment
observation, let's optimize virtual IPI latency more aggressively to
inject target IPI as soon as possible.
Running kvm-unit-tests/vmexit.flat IPI testing on SKX server, disable
adaptive advance lapic timer and adaptive halt-polling to avoid the
interference, this patch can give another 7% improvement.
w/o fastpath -> x86.c fastpath 4238 -> 3543 16.4%
x86.c fastpath -> vmx.c fastpath 3543 -> 3293 7%
w/o fastpath -> vmx.c fastpath 4238 -> 3293 22.3%
Cc: Haiwei Li <[email protected]>
Signed-off-by: Wanpeng Li <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/bin/stackcollapse-report')
0 files changed, 0 insertions, 0 deletions