CentOS 5.5 100% CPU use 50% of the CPU of the host - very simple config

Hello.

On an upgrade on ESXi 4.0u1 - & gt; ESXi 4.1, I got a CentOS 5.5 32bits with VMware tools and local storage SCSI RAID5.

Host: IBM x 346 Intel Xeon 3, 4 Mhz single core, hyper-threading, dual-CPU 10 GB of RAM.

VM: CentOS 5.5 32bits, kernel 2.6.18 - 194.11.1.el5 #1 SMP

VM resources: 4 vCPU, 4096 MB RAM, affinity and default limits

I've got high utilization of the processor on this light apache + mysql box. In order to optimize the system, I came to this observation:

-When my CentOS VM uses 100% cpu, the ESXi host uses only 50%

My question is: why is it impossible to use more cpu, as this the only VM on the host?

Clues or tips?

TIA

First of all, you have an absolutely incorrect configuration.

You see 2 CPU * HT * 1 core = 4 logical processors in ESXi. But actually it's only 2 physical cores, and you should not give any VM on the ESXi exceeding 2 vCPU, because it isn't real processors and VM is not aware of it.

If you have 2 virtual machines with 2 vCPUs each then Yes, HT will give performance gain, but not in this case.

---

MCSA, MCTS Hyper-V, VCP 3/4, VMware vExpert

http://blog.vadmin.ru

Tags: VMware

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