linux-kernel - Re: [Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config options and disableunsupported config options.

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Date:	Sat, 17 Feb 2007 10:06:40 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Dan Hecht <dhecht@...are.com>
CC:	Zachary Amsden <zach@...are.com>, Keir Fraser <keir@...source.com>,
	Chris Wright <chrisw@...s-sol.org>,
	virtualization@...ts.osdl.org, xen-devel@...ts.xensource.com,
	Christian Limpach <Christian.Limpach@...source.com>,
	Andi Kleen <ak@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Hand <steven.hand@...cam.ac.uk>,
	linux-kernel@...r.kernel.org, Ian Pratt <Ian.Pratt@...source.com>
Subject: Re: [Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config	options
 and disableunsupported config options.

Dan Hecht wrote:

> Yes, and regardless of whether you run your periodic timer slower than 
> HZ, calibrating time in a VM is always difficult due to the fact the 
> kernel is time sharing the physical cpu.  Why not just ask the 
> underlying hypervisor?

Upstream Xen does just that.

I'm guessing we'll want something similar for KVM paravirt.

-- 
Politics is the struggle between those who want to make their country
the best in the world, and those who believe it already is.  Each group
calls the other unpatriotic.
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