• Paolo Bonzini's avatar
    KVM: x86: lower default for halt_poll_ns · b401ee0b
    Paolo Bonzini authored
    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: default avatarPaolo Bonzini <pbonzini@redhat.com>
    Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
    b401ee0b
kvm_host.h 40.7 KB