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very high ready and wait times

  • 1.  very high ready and wait times

    Posted Feb 15, 2017 04:18 PM

    am i seeing a cpu bottleneck here?



  • 2.  RE: very high ready and wait times

    Posted Feb 17, 2017 08:59 AM

    You need to provide a little more info

    How many CPUs/Cores on the host?

    is these values realtime, past day, past month?



  • 3.  RE: very high ready and wait times

    Posted Feb 22, 2017 01:13 AM

    these are realtime. host is 2 cpu and 8 cores/cpu. cpu util on the host is only at 10%



  • 4.  RE: very high ready and wait times

    Posted Feb 22, 2017 03:13 AM

    Looks like you have some VMs with unwanted resources over allocation. You should check the below KB and see if thats the case in your VM Infra.

    Techies Sphere: VMware Virtual Machine's Resources Allocation Common Best Practices !

    Thanks,

    Amit



  • 5.  RE: very high ready and wait times

    Posted Feb 22, 2017 03:49 PM

    this is from my esxi host.

    for cpu ready and wait times should i be looking at VM or esxi host? or both?



  • 6.  RE: very high ready and wait times

    Posted Feb 22, 2017 04:10 PM

    Tdubb,

    Are you getting any performance related issue in your VM level?

    Do you have SRiov enabled in the host?

    I've come across such incident due to weak storage,check any storage level bottleneck.



  • 7.  RE: very high ready and wait times

    Posted Feb 22, 2017 04:25 PM

    no performance issues. but checking cpu ready and wait times. not sriov.



  • 8.  RE: very high ready and wait times

    Posted Feb 23, 2017 04:18 AM

    You should check both.. :smileyhappy:

    Why? ESXi host is responsible to provide compute resources to VMs (e.g. RAM, CPU) and VMs are responsible to run your applications using their allocated resources.

    If the ESXi is overloaded or VMs are over-provisioned, both are going to create problem in Virtualisation. So, the conclusion is, you should check and balance both (VM and Esxi host) for better performance overall.

    To find out overloaded host, you can check the performance of your ESXi hosts in the cluster and to check the over-provisioned Vms you can use the KB below:

    http://www.techiessphere.com/2016/02/vmware-virtual-machine-resources.html

    Thanks,

    Amit



  • 9.  RE: very high ready and wait times

    Posted Feb 23, 2017 08:09 PM

    al the VMs I have are dual cpu 4gb ram. same OS

    I am just confused on why the physical cpu utlization is at 10% but the cpu ready and wait times are so high



  • 10.  RE: very high ready and wait times

    Posted Feb 24, 2017 05:08 AM

    I recommend you to read the below article to clear your confusion about low host usage and high ready usage case scenario. I am sure, It will be helpful..

    http://www.joshodgers.com/2013/01/12/high-cpu-ready-with-low-cpu-utilization/

    Overall what I can say is, you have to re-evaluate and analyse your VMs sizing. This may help you at every level of performance optimisation.

    Thanks,

    Amit



  • 11.  RE: very high ready and wait times

    Posted Mar 01, 2017 10:12 PM

    so above what value is considered a bottleneck when looking at cpu ready and wait times or co-stop?



  • 12.  RE: very high ready and wait times

    Posted Mar 13, 2017 04:42 PM

    If its above 5.5 approximately.. It should be problematic..

    Explained in below KB already provided in beginning our our conversation.. :smileyhappy:

    http://www.techiessphere.com/2016/02/vmware-virtual-machine-resources.html