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RE: [Xen-devel] A question about CONFIG_SMP

To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>, "Tian, Kevin" <kevin.tian@xxxxxxxxx>
Subject: RE: [Xen-devel] A question about CONFIG_SMP
From: "Nakajima, Jun" <jun.nakajima@xxxxxxxxx>
Date: Thu, 23 Feb 2006 11:40:53 -0800
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Thread-topic: [Xen-devel] A question about CONFIG_SMP
Keir Fraser wrote:
> On 23 Feb 2006, at 08:51, Tian, Kevin wrote:
>> Just a curious question, does anyone still care xen/UP? If yes,
>> current xen-unstable.hg failed to build quickly after undef
>> CONFIG_SMP since many structures include types defined only when
>> CONFIG_SMP is on. 
>> Just realize this issue when cleanup some IA64 code recently, where
>> CONFIG_SMP is still unstable and thus UP only.
>> Is there any benefit to have xen/UP? Reducing image size is the
>> immediate answer in my head...
> It's not supported for xen/x86 at least. Dynamically adding LOCK
> prefixes if the system turns out to be multiprocessor is the only
> optimisation I think would be worthwhile. But really
> multi-processor/core/thread is what we care about.
>   -- Keir

That's right. I think the right thing to do is to set CONFIG_SMP by
default forcing people to stabilize IA-64 Xen ASAP, rather than keeping
it UP only.

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