[Xen-devel] Re: TSC scaling and softtsc reprise, and PROPOSAL

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 23/07/2009 16:18, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote:

>> I've informally heard that certain version of the JVM and
>> Oracle Db have a habit of pounding rdtsc hard from user
>> space, but I don't know what rates.
> 
> Indeed they do and they use it for timestamping
> events/transactions, so these are the very same
> apps that need to guarantee SMP timestamp ordering.

Why would you expect host TSC consistency running on Xen to be worse than
when running on a native OS?

 -- Keir



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