I implemented "show runtime", "show errors", "show hardware detail". In all
cases I used cli_inband, VPPStats (not for hardware) and VAT.

I run tests with traffic, tests used 1 core and 2 cores. The couters are reset before the each test. VPP version: 19.08-rc0~341-gb19bf8de1~b2905

See the logs. You can find there the raw output from PAPI and also human readable output:

1 core: https://logs.fd.io/production/vex-yul-rot-jenkins-1/csit-vpp-perf-verify-master-2n-skx/464/archives/log.html.gz#s1-s1-s1-s1-s1-t1-k3-k5

2 cores: https://logs.fd.io/production/vex-yul-rot-jenkins-1/csit-vpp-perf-verify-master-2n-skx/464/archives/log.html.gz#s1-s1-s1-s1-s1-t2-k3-k5

show errors:
The difference in results when using VPPStats and cli or VAT is there in both cases (1c, 2c). Did you find put why?

show hardware detail:
The results are equal.

show runtime:
1. The list "/sys/node/names" has one less item, 398, than the others, 399, ("/sys/node/calls", "/sys/node/clocks", ...). It seems that the last one is redundant, or not? What is this item?
2. The results look good.