Intel Xeon Quad core, only one core is active

[Claudio_]

Hi.

We have ESX 3.5 installed on one of our servers with xeon core 2 quad processor, 2.4GHz.

I

have a problem with one virtual machine that takes 100% of processor

but problem is not all 4 cores are working on the same time.

when

one core is working others are in passive mode, not working. I mean in

one moment works one core, later works another core and so on but not

more than one core works on the same time.

On VI/performance I see only 25% of processor used and full frequency speed 2.4GH

My Dell server has latest bios update.

Please, what can I do for having all 4 cores on normal active mode, active on the same time.

Thank you in advance.

Bye.

[joeyCon]

What are you running to drive the server?

I am assuming that the application you are using is multi-threaded?

when you run a couple of factorial calculations (open calc, type 9999999 then hit n!) on the server does the CPU remain at 25%?

[weinstein5]

I see you have double posted this - this is the normal functioning if you only have a single vCPU assigned to the VM - check out other post for my complete answer

If you find this or any other answer useful please consider awarding points by marking the answer correct or helpful