Inside the guest, I am using "perf stat -e dTLB-load-misses -e dTLB-loads -e L1-dcache-loads -e L1-dcache-load-misses -e L1-dcache-prefetch-misses ", followed by the parsec command. Thanks. - Hui On Wed, Aug 27, 2014 at 12:28 PM, Liang, Kan <kan.liang@xxxxxxxxx> wrote: > >> > Hi, Kan, >> > >> > The dTLB-load-misses is 0, but it shows 80.00%hit, does that mean the >> > TLB- load miss is 0.8 * (dTLB-loads). Thanks. >> > >> > Performance counter stats for './parsecmgmt -a run -i native -c >> > gcc-hooks -n >> > 1 -p freqmine': > > I'm not familiar with parsecmgmt. What’s the perf commands it calls? > >> > >> > >> > 0 dTLB-load-misses # 0.00% of all dTLB >> > cache hits [80.00%] >> > >> > 782,565,273,315 dTLB-loads >> > [80.00%] >> > >> > 782,552,911,616 L1-dcache-loads >> > [80.00%] >> > >> > 5,810,697,456 L1-dcache-load-misses # 0.74% of all >> > L1-dcache hits [80.00%] >> > >> > 2,145,907,209 L1-dcache-prefetch-misses >> > [80.00%] >> > >> > - Hui >> > >> > On Wed, Aug 27, 2014 at 9:05 AM, Liang, Kan <kan.liang@xxxxxxxxx> wrote: >> > > >> > > >> > >> >> > >> Dear KVM developers: >> > >> I am trying use perf stat inside a VM to obtain some hardware cache >> > >> performance counter values. >> > >> The perf stat can report some numbers for L1 and TLB related >> > >> counters. But for the LLC-loads and LLC-load-misses, the numbers >> > >> are always 0. It seems that the these offcore events are not >> > >> exposed to the >> > guest. >> > >> >> > >> Is this a bug in Qemu or KVM? >> > >> >> > > >> > > There is no offcore virtualization support in KVM yet. >> > > For you case, I guess you are using paravirt for guest, so it should be 0. >> > > Otherwise, you should get #GP in guest. >> > > >> > > >> > >> My testbed is >> > >> >> > >> Host kernel: 3.12.26 >> > >> Qemu: 2.1.0 >> > >> CPU: Intel Ivy bridge 2620 >> > >> VM boosted by qemu, with -cpu host. >> > >> >> > >> Thanks. >> > >> >> > >> - Hui Kang -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
