Re: [Xen-devel] RE: [PATCH] rendezvous-based local time calibration WOW!

[John Levon <levon@xxxxxxxxxxxxxxxxx>]

On Tue, Aug 05, 2008 at 02:49:25PM -0600, Dan Magenheimer wrote:

> The algorithm used to compute the timestamp information

Thanks.

> I'm not sure its possible to guarantee monotonicity in
> PV domains (without a global lock) except by doing a trap
> or hypercall at each "get time".

That's a shame.

> I've thought about implementing softtsc for PV domains for
> this reason.  (Softtsc was just added at 4.0 for hvm domains
> and causes all hvm tsc reads to trap.)  Would this be of
> interest?

No, as it would be incredibly slow on Solaris (I dread to imagine).

regards,
john

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