VMware ESX and Hyper-Threading

VMware ESX and Hyper-Threading

VMware ESX and Hyper-Threading 150 150 Roderick Derks

This article is based on my own performance measurements using the passmark tool.

Hyper-Threading gives you a 15% to 20% performance gain on "common" VM's. Some CPU intensive applications which are not multi-threaded build can suffer badly from Hyper-Threading functionality. I think this is because a physical CPU core is split and delivers 50% of the perfomance of the physical core on a vCPU (1 CPU with 4 cores and Hyper-Threading enabled gives you 8 vCPU's).

Because the application is not multi-threaded it will not make full use of multi-threading. Disabling Hyper-Threading on the VM gives a slight improvement. Disabling Hyper-Threading in the BIOS of the ESX host makes the performance go up to around 170%.

Roderick Derks

Liefhebber van fietsen, van het oplossen van IT puzzels, en van het delen van informatie om anderen te helpen.

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