Gentoo/Linux freezing under VMware ESX/ESXi

We recently got in trouble with two Gentoo machines that where running under VMware ESX & ESXi.

The hosts froze randomly (Even the console in vmware froze). Especially when putting a little load on the machines. After hours of testing we found that removing virtual CPU’s from the host solved the problem. More that one CPU got the machine to freeze after some time.

!! Unsatisfied solution !! So after a couple of more hours we found a working solution….

The solution was to disable the time stamp counter hardware in the host. This is done by passing notsc on the kernel command line. 

We found people running Ubuntu with a similar problem and some of them solved the problem with passing clocksource=acpi_pm on the kernel command line. The clocksource problem is known by VMware and more information can be found here This did however not solved our problem but some readers may find it helpful. 


Posted in Hosting, Operatingsystem at November 5th, 2008. Trackback URI: trackback Tags: , , , , Written by: 
  • Ronnie

    Thanks a lot for the information! I am sitting in a similar issue and by appending the notsc seems helping my team to get around the issue. :)

  • Mathias Stjernström

    Glad I could help.

    Took us several days to find this one out :)


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