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From: Rik van Riel <riel@redhat.com>
To: Dan Hecht <dhecht@vmware.com>
Cc: Zachary Amsden <zach@vmware.com>,
	Keir Fraser <keir@xensource.com>,
	Chris Wright <chrisw@sous-sol.org>,
	virtualization@lists.osdl.org, xen-devel@lists.xensource.com,
	Christian Limpach <Christian.Limpach@xensource.com>,
	Andi Kleen <ak@muc.de>, Andrew Morton <akpm@linux-foundation.org>,
	Steven Hand <steven.hand@cl.cam.ac.uk>,
	linux-kernel@vger.kernel.org, Ian Pratt <Ian.Pratt@xensource.com>
Subject: Re: [Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config	options and disableunsupported config options.
Date: Sat, 17 Feb 2007 10:06:40 -0500	[thread overview]
Message-ID: <45D71A00.5080104@redhat.com> (raw)
In-Reply-To: <45D63255.2070801@vmware.com>

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.

WARNING: multiple messages have this Message-ID
From: Rik van Riel <riel@redhat.com>
To: Dan Hecht <dhecht@vmware.com>
Cc: Zachary Amsden <zach@vmware.com>,
	xen-devel@lists.xensource.com, Andi Kleen <ak@muc.de>,
	Steven Hand <steven.hand@cl.cam.ac.uk>,
	linux-kernel@vger.kernel.org, Ian Pratt <Ian.Pratt@xensource.com>,
	Chris Wright <chrisw@sous-sol.org>,
	virtualization@lists.osdl.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Keir Fraser <keir@xensource.com>,
	Christian Limpach <Christian.Limpach@xensource.com>
Subject: Re: Re: [patch 14/21] Xen-paravirt: Add XEN config	options and disableunsupported config options.
Date: Sat, 17 Feb 2007 10:06:40 -0500	[thread overview]
Message-ID: <45D71A00.5080104@redhat.com> (raw)
In-Reply-To: <45D63255.2070801@vmware.com>

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.

  reply	other threads:[~2007-02-17 15:09 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-16 10:00 [patch 14/21] Xen-paravirt: Add XEN config options and disableunsupported config options Christian Limpach
2007-02-16 10:00 ` Christian Limpach
2007-02-16 10:09 ` Andrew Morton
2007-02-16 10:09   ` Andrew Morton
2007-02-16 10:47   ` Keir Fraser
2007-02-16 10:47   ` Keir Fraser
2007-02-16 10:47     ` Keir Fraser
2007-02-16 10:54     ` Andrew Morton
2007-02-16 10:54       ` Andrew Morton
2007-02-16 11:03       ` Keir Fraser
2007-02-16 11:03       ` Keir Fraser
2007-02-16 11:03         ` Keir Fraser
2007-02-16 17:46         ` [Xen-devel] " Jeremy Fitzhardinge
2007-02-16 17:46           ` Jeremy Fitzhardinge
2007-02-16 19:00           ` [Xen-devel] " Keir Fraser
2007-02-16 19:00           ` Keir Fraser
2007-02-16 19:00             ` Keir Fraser
2007-02-16 19:24             ` [Xen-devel] " Jeremy Fitzhardinge
2007-02-16 19:24               ` Jeremy Fitzhardinge
2007-02-16 21:51             ` [Xen-devel] " Zachary Amsden
2007-02-16 21:51               ` Zachary Amsden
2007-02-16 22:38               ` [Xen-devel] " Dan Hecht
2007-02-17 15:06                 ` Rik van Riel [this message]
2007-02-17 15:06                   ` Rik van Riel
2007-02-16 19:00           ` [Xen-devel] " Keir Fraser
2007-02-16 11:03       ` Keir Fraser
2007-02-16 10:47   ` Keir Fraser

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