From: [EMAIL PROTECTED] on behalf of Dan Kenigsberg
Sent: Wed 13/02/2008 13:25
To: Koen Vermeer
Cc: kvm-devel@lists.sourceforge.net
Subject: Re: [kvm-devel] Clock off in guest
>On Wed, Feb 13, 2008 at 10:41:44AM +0100, Koen Vermeer wrote:
>> Hi,
>>
>> I'm running an Linux AMD64 guest on an AMD64 host. The host is running a
>> 2.6.23 kernel (self compiled), the guest is running a stock
>> linux-image-2.6.22-3-amd64 Debian kernel.
>>
>> My problem is that the clock on the guest is off (slow), while the clock
>> on the host seems to be OK. When doing 'time sleep 10' on the guest, it
>> takes about 16 'real' seconds for it to finish.
>
>What is the clock source of your guest? If it is the traditional PIT,
>you describe a known problem in busy hosts. You may try to set
>clocksource=tsc in the guest kerenl parameters.
>
>Regards,
>
>Dan.
Hi,
This would not work if you are using an old version of kvm ( with no
in-kernel-apic )
I recommend upgrading to kvm-60 (or latest linux kernel).
Or as an alternative, probably not as good, sometimes (when the guest's
clocksource is PIT) adding '-tdf' to the command line helps.
Uri.
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