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

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Will Xen 4.0 release use the pv-ops kernel despite it's performance hit
From: Tom Rotenberg <tom.rotenberg@xxxxxxxxx>
Date: Mon, 21 Dec 2009 08:16:32 +0200
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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?

On Sun, Dec 20, 2009 at 11:53 PM, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote:
> On 20/12/2009 17:41, "Tom Rotenberg" <tom.rotenberg@xxxxxxxxx> wrote:
>> Will Xen 4.0 release use the pv-ops kernel, despite the fact that it
>> has about ~15% hit in performance?
>> This is a major performance hit, and releasing a new Xen version with
>> a 15% performance hit in the dom0 kernel compared to a previous
>> version, will just cause people not to upgrade to Xen 4.0 (especially
>> if Xen 4.0, won't support the old 2.6.18 xen kernel anymore).
>> Is this performance issue going to be addressed prior to Xen 4.0 release?
> Work on both stabilisation and performance will be ongoing. But bear in mind
> that upgrading to Xen 4.0 will not require users to switch to pv_ops dom0.
>  -- Keir

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