Dear all
I used cachebench to test if perf works well with collecting Hardware
event count and Hardware cache event count in guest. Most events'
count were correct(almost as same as host), while the count of
cache-refernecs, L1-dcache-load-misses, L1-icache-load-misses,
dTLB-load-misses and iTLB-load-misses were much more larger than in
host. Below is my test result
Host Guest
cache-refernecs 417555 1387017
L1-dcache-load-misses 493385 1210518
L1-icache-load-misses 1422020 4497052
dTLB-load-misses 7182 61347
iTLB-load-misses 6120 32332
my test command is "perf stat -e <event> -r 5 ./cachebench -b -x 2 -m
10 -d 3 -e 1".
HostOS: kernel 3.7.2 CPU was Xeon 5620, 16 core ,48G mem
GuestOS: only 1 vcpu, 8G mem and used "-cpu host"
Any one has some idea with this big difference between Host and Guest
will be help.
Thanks
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