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Re: [Xen-devel] Will Xen 4.0 release use the pv-ops kernel despite it's

To: Tom Rotenberg <tom.rotenberg@xxxxxxxxx>
Subject: Re: [Xen-devel] Will Xen 4.0 release use the pv-ops kernel despite it's performance hit
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Mon, 21 Dec 2009 13:41:46 -0800
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
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On 12/20/2009 10:16 PM, Tom Rotenberg wrote:
I just thought i saw Jeremy's mail about changing the APIC logic in
Xen to conform to the pv-ops kernel, which i thought will cause new
Xen not to work with old dom0 kernel. This isn't the case?

No. Future pvops dom0 kernels will require Xen >= 4.0. Xen 4.0 will still support older dom0 kernels.

BTW, I haven't measured pvops dom0 performance, but there's no particular reason to believe there'll be a big hit (the performance hit I was talking about refers to the overhead of fork/exec-heavy workloads, which is very unlike dom0's workload).


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