Question about high latency of the processor

Hey there,

Hoping that someone here is able to help me with a high level of CPU Ready I see in one of my groups.

Our cluster specification:

8 guests - ESXi 4.0

Dual - core Xeon 6 per host

72 GB memory per host

DRS and HA on

Resources to its customers:

32 guests (4 per host) with 4 vCPU and 20 GB of memory (use ave is 15 to 17 GB)

The guests are Win 2 k 3 servers. Most traffic is read traffic and traffic - based application and is busy. Load of the CPU on each host is about 40-50% to the total of peak, but guests are higher than I think we should for the time loan CPU. See the chart below. I was wondering how concerned I should be at the ready time CPU?

CPUReady.PNG

My first thought is that if the server has 12 hearts and we have 4 guests each asks 4 vCPUs in time with an activity semi busy, then we'll always see higher than normal loan of CPU time. Mainly because there is always one of the guest who has be waiting for the moment on the processors. So assuming that it is correct, if I was to lower the number of CPU 3 on each client (or maybe even 2), I should actually see the loan CPU time go to zero without affecting the performance of comments? maybe even win a few performance?

Just check my logic here. Making sure that I'm not crazy (which my wife would probably).  :-)

Thanks in advance!

-Adam

The rule is that whatever it is ready by more than 10% * by vCPU * is bad, if with vCPU you will get higher numbers, so its nothing to worry too much.

Jason Boche said it is much better that I did

http://www.yellow-bricks.com/2010/01/05/ESXTOP-valuesthresholds/comment-page-1/#comment-5861

are you really an application performance problems?

Tags: VMware

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