Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load.

[Anthony Liguori <anthony@codemonkey.ws>]

Gleb Natapov wrote:
> On Thu, Nov 06, 2008 at 03:35:16PM +0100, andrzej zaborowski wrote:
>   
>>
>> We're talking about emulating the hw.  We have to make compromises
>> sometimes, but we try to avoid them.
>>
>>     
> Fair enough. Can we compromise in this case :)
>   

We have work ahead of us to determine how much of a problem this really 
is.  My suspicion is that we're going to discover that it's pretty 
difficult to produce noticable drift when using hosts with high 
resolution timers.

I think we'll also find that it's relatively easy to produce drift on 
older hosts.  If that's the case, I don't think anything that's very 
invasive is going to be acceptable because of diminishing returns.

I think that a well isolated, optional work around that's enabled only 
on hosts that lack high resolution timers will probably be the solution.

Regards,

Anthony Liguori

> --
> 			Gleb.
>
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>