Forums.ATC.no
Teknisk => Generelt teknisk => Emne startet av: ATC på 01. November 2008, 12:01 pm
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When trying to install CentOS 5.2 as a guest OS under VMware ESX Server 2.5.1 the guest runs extremely slow and frequently appears to hang.
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Start the installation with the following kernel arguments:
"linux clocksource=acpi_pm"
When installing the GRUB bootloader, make sure the same kernel arguments is added.
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1007020
Clocksource is the name of the new timekeeping subsystem introduced in the Linux 2.6.18 kernel. In this subsystem there are several clocksources that can be used to read the time. One of them is the tsc clocksource which uses the Time Stamp Counter that is present on each processor and can be used to track how much time has elapsed. The TSCs on the different processors are not necessarily perfectly in sync with each other, so time can appear to go backward if the TSC is read on one processor and then another processor. Early versions of the tsc clocksource did not handle this case, which can lead to the guest operating system not responding. Due to the different timing behavior of running in a virtual machine, this can be observed more frequently in a virtual machine.
This fix solves a whole range of problems like RTC slowing down, system stalling, udev startup hanging for 3 hours before timing out etc.
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I finally figured it out :-D
Also recommended is the kernel option "divider=10"