linux-kernel - Re: [announce] [patch] KVM paravirtualization for Linux

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Message-ID: <20070106130817.GB5660@ucw.cz>
Date:	Sat, 6 Jan 2007 13:08:18 +0000
From:	Pavel Machek <pavel@....cz>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	kvm-devel <kvm-devel@...ts.sourceforge.net>,
	linux-kernel@...r.kernel.org, Avi Kivity <avi@...ranet.com>
Subject: Re: [announce] [patch] KVM paravirtualization for Linux

Hi!

> i'm pleased to announce the first release of paravirtualized KVM (Linux 
> under Linux), which includes support for the hardware cr3-cache feature 
> of Intel-VMX CPUs. (which speeds up context switches and TLB flushes)
> 
> the patch is against 2.6.20-rc3 + KVM trunk and can be found at:
> 
>    http://redhat.com/~mingo/kvm-paravirt-patches/
> 
> Some aspects of the code are still a bit ad-hoc and incomplete, but the 
> code is stable enough in my testing and i'd like to have some feedback. 
> 
> Firstly, here are some numbers:
> 
> 2-task context-switch performance (in microseconds, lower is better):
> 
>  native:                       1.11
>  ----------------------------------
>  Qemu:                        61.18
>  KVM upstream:                53.01
>  KVM trunk:                    6.36
>  KVM trunk+paravirt/cr3:       1.60

Does this make Xen obsolete? I mean... we have xen patches in suse
kernels, should we keep updating them, or just drop them in favour of
KVM?
							Pavel
-- 
Thanks for all the (sleeping) penguins.
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