ESXI Guest VM is using 100% Guest CPU, but only 7% Host CPU

You're running a very old version of 5.5 so one of the first things I'd do is to install the latest patches.

We have a Dell T420 server running ESXi 5.5. The host has a single E5-2407 CPU (4 Core 2.2 GHz no Hyperthreading), 16 GB of RAM, and local RAID storage. The host runs a single Windows Server 2008 VM, which was a P2V conversion. The VM is currently assigned 1 Socket and 4 Cores, matching the host CPU. Since setting up this server about a year ago, it has had a recurring problem pop up every few months. When the problem happens, the Server 2008 VM suddenly has max CPU usage and terrible performance, but CPU is being maxed not by a single program, but from several normal processes. For example, WMI, explorer.exe, and task manager may all show 30% CPU usage. Meanwhile, though the Guest VM has 100% CPU usage, the Host will show it only using 300-500 MHz of CPU, or about 7% of available. This is despite the fact it's the sole VM and has full...
This topic first appeared in the Spiceworks Community

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