linux-kernel - RE: [Xen-devel] [PATCH 0/7][v4] PV extension of HVM (Hybrid) for Xen

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Message-ID: <1A42CE6F5F474C41B63392A5F80372B21D43CEF0@shsmsx501.ccr.corp.intel.com>
Date:	Tue, 2 Mar 2010 11:20:10 +0800
From:	"Dong, Eddie" <eddie.dong@...el.com>
To:	Sheng Yang <sheng@...ux.intel.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	xen-devel <xen-devel@...ts.xensource.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ian Pratt <Ian.Pratt@...citrix.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Keir Fraser <keir.fraser@...citrix.com>,
	"Dong, Eddie" <eddie.dong@...el.com>
Subject: RE: [Xen-devel] [PATCH 0/7][v4] PV extension of HVM (Hybrid) for Xen

> 
>> Also, I'd like to see a clearer statement of what you're specifically
>> trying to optimise for here.  What is inefficient in an unmodified
>> HVM domain, and how do your patches address these things.  What
>> measurements have you made?
> 
> The key issue we want to address is the overhead of LAPIC, especially
> EOI and other actions resulted in explicit vmexit. That is the
> overhead we want to eliminate. And evtchn seems like a perfect choice
> to us. 
> 

That is not complete. Linux timer in HVM is always annoying, and time to time make surprise to endusers. PV timer does help here. Eventchannel is nice to HVM as well. 

Thx, Eddie--
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