Messages in this thread | | | Subject | Re: [PATCH 0/18][RFC] Nested Paging support for Nested SVM (aka NPT-Virtualization) | From | Alexander Graf <> | Date | Thu, 4 Mar 2010 00:44:48 +0100 |
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On 03.03.2010, at 20:12, Joerg Roedel wrote:
> Hi, > > here are the patches that implement nested paging support for nested > svm. They are somewhat intrusive to the soft-mmu so I post them as RFC > in the first round to get feedback about the general direction of the > changes. Nevertheless I am proud to report that with these patches the > famous kernel-compile benchmark runs only 4% slower in the l2 guest as > in the l1 guest when l2 is single-processor. With SMP guests the > situation is very different. The more vcpus the guest has the more is > the performance drop from l1 to l2. > Anyway, this post is to get feedback about the overall concept of these > patches. Please review and give feedback :-)
Nice job! It's great to see you finally got around to it :-).
Have you tracked what slows down SMP l2 guests yet? So far I've been assuming that IPIs just completely kill the performance, but I guess it shouldn't be that bad, especially now where you have sped up the #VMEXIT path that much.
Alex
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