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June 2011

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Subject:
Re: clock drift under Hyper-V
From:
Jan van Eldik <[log in to unmask]>
Reply To:
Jan van Eldik <[log in to unmask]>
Date:
Wed, 1 Jun 2011 13:36:32 +0200
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text/plain
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text/plain (29 lines) 
Hi,

>>>> I'm running a couple of CentOS 5.6 instances under Hyper-V. Horrible
>>>> clock drift
>>>> issues, but otherwise okay.
>>>>
>>>
>>> You may want to add:
>>>
>>> divider=10 clocksource=acpi_pm
>>>
>>> to kernel arguments in /etc/grub.conf
>>>
>>> to correct the clock drift problem.
>>
>> Doesn't help me.

Just to add that we different parameters on 32bit and 64bit SLC5 systems.
 From https://cern.service-now.com/kb_view.do?sysparm_article=KB0000278

     * SLC5/x86_64: "divider=10 clock=pmtmr"
     * SLC5/i386: "divider=10 clocksource=acpi_pm"
     * SLC4/x86_64: "divider=10 notsc"
     * SLC4/i386: "divider=10 notsc"

These parameters seem to work fine on 500+ VMs

                 cheers, Jan

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