On Fri, May 26, 2023 at 07:16:09PM +0200, br...@mailbox.org wrote: > > On 05/26/2023 6:06 PM CEST Mike Larkin <mlar...@nested.page> wrote: > > > > perf top on the linux side to see where qemu is spending it's time? > > Sure, I ran `perf top -p $PID` with $PID being the PID of the QEMU process > and copied the screen after a few seconds. Let me know if you intended > something different: > > PerfTop: 133 irqs/sec kernel:72.9% exact: 0.0% lost: 0/0 drop: 0/0 > [4000Hz cycles], (target_pid: 9939) > -------------------------------------------------------------------------------------------------------------------------------------------------- > > 25.35% [kvm_amd] [k] svm_vcpu_run > 4.18% [kernel] [k] native_write_msr > 4.01% [kernel] [k] native_read_msr > 3.73% [kernel] [k] read_tsc > 3.64% [kvm] [k] kvm_arch_vcpu_ioctl_run > 2.21% [kvm_amd] [k] svm_vcpu_load > 1.98% [kernel] [k] ktime_get > 1.47% [kvm] [k] kvm_apic_has_interrupt > 1.40% [kernel] [k] restore_fpregs_from_fpstate > 1.29% [kvm] [k] apic_has_interrupt_for_ppr > 1.18% [kernel] [k] check_preemption_disabled > 1.10% [kernel] [k] x86_pmu_disable_all > 1.07% [kernel] [k] __srcu_read_lock > 1.07% [kernel] [k] newidle_balance > 1.03% [kvm] [k] kvm_pmu_trigger_event > 0.98% [kernel] [k] amd_pmu_addr_offset > > I tried this also on the FreeBSD VM and the irqs/sec were between 2 and 4. >
you might just be bombarded with ipis. how many vcpus?
