Re: guest gettimeofday behavior

[Avi Kivity <avi@redhat.com>]

On 06/25/2009 04:25 PM, Eran Rom wrote:
> Hi All,
> Am a newbie (to kvm, linux kernel, git, etc.) so apologize in advance for
> missing/inaccurate info.
> I am experiencing inconsistent behavior of guest gettimeofday, described below.
> I have seen prior reference to the problem, however, it was not clear whether
> the issue was solved or not and where.
>
> Below is a description of my setup and the behavior I see.
> Another question is whether oprofile with timer mode would suffer from the same
> problem?
>    

Probably, yes.

> Otherwise I saw that kvm-85 has "generic performance counter msr handling", does
> this mean that oprofile can be executed without the timer mode?
>    

No, we don't really emulate the performance counters, only when they're 
disabled.

> Setup:
> Guest 32 bit ubuntu with 2.6.27 kernel
> Host 64 bit Suse 10.2 with 2.6.27 kernel
>    

What's the guest clocksource? (/sys/.../current_clocksource)?

> 1 quadcore Intel Xeon CPU
> I am not sure about the kvm userspace code version.
> Used git to create a repository, and then did
> git checkout kvm-updates-2.6.27 (is that fixed in time?)
>    


That's really old.  Just use qemu-kvm.git.

-- 
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