> > If I understand that paper correctly, HVM+VT-d outperforms PV by quite a > > lot (if you have VT-d support on your system). > > > > Thanks for that link. Just to make my criticism of the initial claim more > clear: I don't claim that HVM can never be faster than PV but that you need > to understand when exactly this is the case. For example I'm not sure that > x86_64 vs. x86 really enters into this but I can definitely see VT-d making > an impact there. > > Regards, > Dennis > > > Even though this is Intel talking I'd still be very sceptical of getting those numbers since this is quite the opposite of what I've seen. Maybe the vt-d is getting good enough to actually accelerate IO operations but even so that would only happen on the latest hardware.
I will say that Xen has a really long packet path though. Grant McWilliams
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