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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] Does a PAE domU work with non-PAE dom0?
> Just out of interest, with a 64-bit hypervisor, which of the HVM options > (32, 32p, 64) will give the lowest overhead? Or are they going to be > more the same than they are different? Hmmm. I suspect they're more the same than different... It *might* be that one or the other reduces the overhead of maintaining shadow pagetables. But I wouldn't be surprised if they came out fairly similar in terms of overhead. Of course, if you use a 64-bit guest then the guest applications get the advantage or a larger virtual memory space and of extra registers, so they may benefit in performance because of that. Amusingly for PV guests, I strongly suspect the overhead is lower when running 32-bit PAE guests on 64-bit Xen than when running native 64-bit guests. That may well extend to dom0 too. Also, glibc's negative segment offset tricks would work for 32-bit guests under 64-bit Xen at full performance... Crazy stuff ;-) Cheers, Mark -- Dave: Just a question. What use is a unicyle with no seat? And no pedals! Mark: To answer a question with a question: What use is a skateboard? Dave: Skateboards have wheels. Mark: My wheel has a wheel! _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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