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


From: Anthony Liguori
Subject: Re: [Qemu-devel] [RESEND][PATCH 0/3] Fix guest time drift under heavy load.
Date: Thu, 06 Nov 2008 09:41:46 -0600
User-agent: Thunderbird 2.0.0.17 (X11/20080925)

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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