linux-kernel - Re: Paravirtualization on VMware's Platform [VMI].

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Message-ID: <4AB48BAC.1000409@redhat.com>
Date:	Sat, 19 Sep 2009 10:43:40 +0300
From:	Avi Kivity <avi@...hat.com>
To:	akataria@...are.com
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Chris Wright <chrisw@...s-sol.org>,
	virtualization@...ts.osdl.org
Subject: Re: Paravirtualization on VMware's Platform [VMI].

On 09/18/2009 03:17 AM, Alok Kataria wrote:
> Hi,
>
> We ran a few experiments to compare performance of VMware's
> paravirtualization technique (VMI) and hardware MMU technologies (HWMMU)
> on VMware's hypervisor.
>
> To give some background, VMI is VMware's paravirtualization
> specification which tries to optimize CPU and MMU operations of the
> guest operating system. For more information take a look at this
> http://www.vmware.com/interfaces/paravirtualization.html
>
> In most of the benchmarks, EPT/NPT (hwmmu) technologies are at par or
> provide better performance compared to VMI.
> The experiments included comparing performance across various micro and
> real world like benchmarks.
>    

We've reached a similar conclusion for kvm pvmmu vs ept/npt.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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