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Date: Tue, 9 May 2017 18:04:57 +0200 From: Paolo Bonzini <pbonzini@...hat.com> To: Bandan Das <bsd@...hat.com> Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2 0/3] nVMX: Emulated Page Modification Logging for Nested Virtualization On 09/05/2017 18:03, Bandan Das wrote: >> I tested this with api/dirty-log-perf, and nested PML is more than 3 >> times faster than pml=0. I want to do a few more tests because I don't >> see any PML full exits in the L1 trace, but it seems to be a nice >> improvement! > > Thanks for testing! Regarding the PML full exits, I did notice their > absence. I induced it artifically in my testing with a lower index > and it seemed to work fine. Yes, tracing showed that it's because the guest's EXTERNAL_INTERRUPT exits are too frequent. Paolo
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