* 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;
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