Le Lundi 19 Juin 2006 15:35, Magenheimer, Dan (HP Labs Fort Collins) a écrit : > > > > On this point VTi may have a real advantage over > > > > paravirtualization. > > > > > Could you explain further? > > > > Yes. > > The virtualization handler has the opcode in GR25. > > I don't know the amount of PAL code involved, but the > > hardware might provides > > the opcode directly from the pipeline. The VM doesn't have > > to do the fecth, > > which is time and cache consuming. > > No the hardware does not provide the opcode directly, though > perhaps it will in future (post-Montecito) implementations. > I believe that PAL is doing the same thing that Xen is > doing to fetch the opcode, except since it is doing it > sooner, there is a higher probability that it will be > successful. And I suspect that it may be doing the > "slow path" every time as it is probably not capable > of handling (and recovering from) TLB misses. I'm not > sure I would call this an advantage. I suspected this behavior too. So, this is only a *potential* advantage ;-)
> Perhaps Intel can comment more here... I'm not sure what > info is public. Yes, I suppose this info is not public... Tristan. _______________________________________________ Xen-ia64-devel mailing list Xen-ia64-devel@lists.xensource.com http://lists.xensource.com/xen-ia64-devel
