RE: [Xen-devel] [PATCH] softtsc for PV domains

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

> > Attached patch implements softtsc (TSC emulation) for userland
> > code in PV domains.  It currently is tied to the existing
> > "softtsc" Xen boot option (which does the same thing but for
> > HVM domains).  Later it should be tied to a
> > vm.cfg option, but this is sufficient for now to obtain
> > performance degradation data for PV environments that
> > heavily utilize rdtsc.  To record emulation frequency,
> > additional output has been added to debug-key "t".
> 
> Changeset 20128 is a fixed and simplified version of this. 
> Please take a
> look and test.
> 
>  -- Keir

Thanks!

Looks good and seems to work.  I'm not sure why you wanted
to move the frequency info from the "t" debug key to the
new "s" debug key... and I'm a bit worried that since the "s"
key only registers if booted with softtsc, someone else will
use the "s" key for something else and cause a conflict
that won't be noticed until later.

Dan

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