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

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Date:	Mon, 27 Aug 2007 19:54:41 +0200
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Avi Kivity <avi@...ranet.com>, 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 16:25 +1000, Rusty Russell wrote:
> 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.

Hrm... how do you deal with X doing IOs ?

Ben.


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