Correlating %RDY in esxtop to CPU Usage in Guest

Posted by Joe on Server Fault See other posts from Server Fault or by Joe
Published on 2014-06-02T22:58:25Z Indexed on 2014/06/03 3:30 UTC
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linux

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vmware-esx

We recently upgrade a number of our VmWare hosts from 4.1 to 5.5 and noticed many of the VMs saw a step-wise jump in CPU usage as shown by the guest VM. We have not yet upgraded vmwaretools on any of the guests, but after investigating a bit more we saw many of these guests with a high %RDY value (>50%) when viewed under esxtop. Unfortunately Linux (the guest) just shows "high CPU usage" without any insight into what portion of that is coming from %RDY (VmWare saying, "your guest is waiting on CPU from the host"). Are there any tools, /proc entries, etc. that can shed light on that information?

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