On 10/08/2013 11:08 PM, Marc Zyngier wrote: > This is a respin of a patch I posted a long while ago, this time with > numbers that I hope to be convincing enough. > > The basic idea is that spinning on WFE in a guest is a waste of > resource, and that we're better of running another vcpu instead. This > specially shows when the system is oversubscribed. The guest vcpus can > be seen spinning, waiting for a lock to be released while the lock > holder is nowhere near a physical CPU. > > This patch series just enables WFE trapping on both ARM and arm64, and > calls kvm_vcpu_on_spin(). This is enough to boost other vcpus, and > dramatically reduce the overhead. > > Branch available at: > git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git kvm-arm64/wfe-trap > > Changes from v1: > - Added CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT, as it seems to give > slightly better results (Thanks to Raghavendra K T) > - Updated commit message with results of 8x configuration > > Marc Zyngier (2): > ARM: KVM: Yield CPU when vcpu executes a WFE > arm64: KVM: Yield CPU when vcpu executes a WFE Using PLE handler and enabling CPU_RELAX_INTERCEPT part of the patches looks fine. _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/cucslists/listinfo/kvmarm
