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From: Shailabh <nagar@watson.ibm.com>
To: Rik van Riel <riel@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	ckrm-tech <ckrm-tech@lists.sourceforge.net>,
	Jeff Dike <jdike@karaya.com>
Subject: Re: [ckrm-tech] Re: [RFC] Revised CKRM release
Date: Fri, 30 Apr 2004 15:47:44 -0400	[thread overview]
Message-ID: <4092AD60.1030809@watson.ibm.com> (raw)
In-Reply-To: <Pine.LNX.4.44.0404301502550.6976-100000@chimarrao.boston.redhat.com>

Rik van Riel wrote:
> On Fri, 30 Apr 2004, Christoph Hellwig wrote:
> 
> 
>>I'd hate to see this in the kernel unless there's a very strong need
>>for it and no way to solve it at a nicer layer of abstraction, e.g.
>>userland virtual machines ala uml/umlinux.
> 
> 
> User Mode Linux could definitely be an option for implementing
> resource management, provided that the overhead can be kept
> low enough.
> 
> For these purposes, "low enough" could be as much as 30%
> overhead, since that would still allow people to grow the
> utilisation of their server from a typical 10-20% to as
> much as 40-50%.
> 


http://www.cl.cam.ac.uk/Research/SRG/netos/xen/performance.html

has some numbers comparing native Linux to UML (and against the Xen 
virtual machine monitor) but its on a 2.4 kernel.

Jeff, do you have any numbers for UML overhead in 2.6 ?

-- Shailabh


  parent reply	other threads:[~2004-04-30 19:48 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-04-29  8:25 [RFC] Revised CKRM release Shailabh Nagar
2004-04-30 16:41 ` Christoph Hellwig
2004-04-30 18:42   ` Shailabh
2004-04-30 19:03   ` [ckrm-tech] " Rik van Riel
2004-04-30 19:17     ` Shailabh Nagar
2004-04-30 19:31       ` Rik van Riel
2004-04-30 20:15         ` Shailabh Nagar
2004-05-01 13:07         ` Hubertus Franke
2004-04-30 22:43       ` Jeff Dike
2004-04-30 19:47     ` Shailabh [this message]
2004-04-30 22:17       ` Jeff Dike
2004-04-30 23:43         ` Herbert Poetzl
2004-05-01  6:10           ` Alex Lyashkov
2004-05-01 14:46             ` Herbert Poetzl
2004-05-02 12:28               ` Alex Lyashkov
2004-05-04 17:29   ` Marcelo Tosatti
2004-05-04 18:13     ` [ckrm-tech] " Hubertus Franke
2004-05-04 17:35 ` Marcelo Tosatti
2004-05-05  0:18   ` [ckrm-tech] " Shailabh Nagar
2004-05-05 18:48     ` Marcelo Tosatti
2004-05-06  0:00       ` Chandra Seetharaman

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