Messages in this thread | | | Date | Sun, 08 Mar 2009 15:08:25 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] xen: core dom0 support |
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Ingo Molnar wrote: > > Since it's the same kernel image i think the only truly reliable > method would be to reboot between _different_ kernel images: > same instructions but randomly re-align variables both in terms > of absolute address and in terms of relative position to each > other. Plus randomize bootmem allocs and never-gets-freed-really > boot-time allocations. > > Really hard to do i think ... >
Ouch, yeah.
On the other hand, the numbers made sense to me, so I don't see why there is any reason to distrust them. They show a 5% overhead with pv_ops enabled, reduced to a 2% overhead with the changed. That is more or less what would match my intuition from seeing the code.
-hpa
-- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.
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