linux-kernel - Re: [PATCH] Add I/O hypercalls for i386 paravirt

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Message-Id: <1187763956.6174.48.camel@localhost.localdomain>
Date:	Wed, 22 Aug 2007 16:25:56 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Avi Kivity <avi@...ranet.com>
Cc:	Zachary Amsden <zach@...are.com>, Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [PATCH] Add I/O hypercalls for i386 paravirt

On Wed, 2007-08-22 at 08:34 +0300, Avi Kivity wrote:
> Zachary Amsden wrote:
> > This patch provides hypercalls for the i386 port I/O instructions,
> > which vastly helps guests which use native-style drivers.  For certain
> > VMI workloads, this provides a performance boost of up to 30%.  We
> > expect KVM and lguest to be able to achieve similar gains on I/O
> > intensive workloads.
> 
> Won't these workloads be better off using paravirtualized drivers? 
> i.e., do the native drivers with paravirt I/O instructions get anywhere
> near the performance of paravirt drivers?

This patch also means I can kill off the emulation code in
drivers/lguest/core.c, which is a real relief.

Cheers,
Rusty.


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