* Anthony Liguori ([EMAIL PROTECTED]) wrote: > From a quick look, I suspect that the number of wildly off TSC > calibrations correspond to the VMs that are misbehaving. I think this > may mean that we have to re-examine the tsc delta computation. > > 10_serial.log:time.c: Detected 1995.038 MHz processor. > 11_serial.log:time.c: Detected 2363.195 MHz processor. > 12_serial.log:time.c: Detected 2492.675 MHz processor. > 13_serial.log:time.c: Detected 1995.061 MHz processor. > 14_serial.log:time.c: Detected 1994.917 MHz processor. > 15_serial.log:time.c: Detected 4100.735 MHz processor. > 16_serial.log:time.c: Detected 2075.800 MHz processor. > 17_serial.log:time.c: Detected 2674.350 MHz processor. > 18_serial.log:time.c: Detected 1995.002 MHz processor. > 19_serial.log:time.c: Detected 1994.978 MHz processor. > 1_serial.log:time.c: Detected 4384.310 MHz processor.
Is this with pinning? We at least know we're losing small bits on migration. From my measurements it's ~3000 (outliers are 10-20k). Also, what happens if you roll back to kvm-userspace 7f5c4d15ece5? I'm using this: diff -up arch/x86/kvm/svm.c~svm arch/x86/kvm/svm.c --- arch/x86/kvm/svm.c~svm 2008-04-16 19:49:44.000000000 -0700 +++ arch/x86/kvm/svm.c 2008-05-14 23:44:18.000000000 -0700 @@ -621,6 +621,13 @@ static void svm_free_vcpu(struct kvm_vcp kmem_cache_free(kvm_vcpu_cache, svm); } +static void svm_tsc_update(void *arg) +{ + struct vcpu_svm *svm = arg; + rdtscll(svm->vcpu.arch.host_tsc); + +} + static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { struct vcpu_svm *svm = to_svm(vcpu); @@ -633,6 +640,9 @@ static void svm_vcpu_load(struct kvm_vcp * Make sure that the guest sees a monotonically * increasing TSC. */ + if (vcpu->cpu != -1) + smp_call_function_single(vcpu->cpu, svm_tsc_update, + svm, 0, 1); rdtscll(tsc_this); delta = vcpu->arch.host_tsc - tsc_this; svm->vmcb->control.tsc_offset += delta; ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel