I am having trouble understanding
the results from the latency counter on the vcentre for our guest VM.
My understanding of the latency counter
is that it will increase when there is contention for physical CPU resources
and that it is a measurement of percentage of time that a guest has to wait to
get access to the CPU resource. However,
all our hosts have more CPU physical cores than the total number of VCPU’s of
our guests. Therefore, if my
understanding is correct, there should be minimal latency and there should be
no contention for physical CPU resources.
We are seeing a number of guest VM wares with a latency of above 10%
which I have read shows significant degradation of performance.
However, our CPU Ready counter
are well below 500 milliseconds. Can
anyone shed any light as to why this might be the case?