Re: [Xen-ia64-devel] Some things to be considered for ptc.ga emulation

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Vendredi 07 Avril 2006 10:40, Xu, Anthony a écrit :
> From: Tristan Gingold
>
> >To: Xu, Anthony; Tian, Kevin; xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> >The race is we don't invalidate while we had to.  This means a ptc.ga is
> >concurrent to an itc.
> >For me there is no race: the itc wins.  Of course, it may loose to do the
> > cpu itc, but it doesn't matter.
>
> Further think, yes, there is no race, some time itc win, some time ptc.ga
> win, If ptc.ga wins, it will impact performance ( extra tlb miss).
>
> One more comment,
> There maybe two vcpus running on same LP, in this situation, VHPT for this
> LP is purged twice.
Correct.
Pathological case ?

Tristan.


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