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  • 1.  Understanding %WAIT CPU Counter

    Posted Mar 11, 2011 05:04 PM

    Hey All,

    I was doing a little digging around in resxtop on our ESXi 4.1 U1 hosts and noticed on the cpu screen that all of the VM's on a given host had %WAIT times in the hundreds (anywhere from 200 to 400). We have received no complaints of the VM's running slowly and the %RDY time was below 1 on all VM's. To make sure there wasn't an I/O issues I checked both the disk and network performance and all looks good there. The ESX host in question has 8 logical cores (dual quad cores) and is currently running 9 single vCPU VM's. I guess the question is, does a high %WAIT time represent an issue in our enviroment?

    Thanks for any help,

    -Jason



  • 2.  RE: Understanding %WAIT CPU Counter
    Best Answer

    Posted Mar 11, 2011 05:08 PM

    I think the below document explains it best

    http://communities.vmware.com/docs/DOC-9279



  • 3.  RE: Understanding %WAIT CPU Counter

    Posted Mar 11, 2011 05:23 PM

    Troy,

    Thank you for the post. After reading the section on %WAIT in that document I have a better understanding of that counter.

    -Jason