linux-kernel - Re: [PATCH 2/3] x86: x2apic/cluster: Make use of lowest priority delivery mode

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Message-ID: <20120519104725.GA18768@moon>
Date:	Sat, 19 May 2012 14:47:25 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Alexander Gordeev <agordeev@...hat.com>,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH 2/3] x86: x2apic/cluster: Make use of lowest priority
 delivery mode

On Fri, May 18, 2012 at 07:51:19PM +0400, Cyrill Gorcunov wrote:
> On Fri, May 18, 2012 at 05:42:37PM +0200, Alexander Gordeev wrote:
> > > Hi Alexander,
> > > 
> > > I'm a bit confused, we do compose destination id from target cpumask
> > > and send one ipi per _cluster_ with all cpus belonging to this cluster
> > > OR'ed. So if my memory doesn't betray me all specified cpus in cluster
> > > should obtain this message. Thus I'm wondering where do you find that
> > > only one apic obtains ipi? (note i don't have the real physical
> > > machine with x2apic enabled handy to test, so please share
> > > the experience).
> > 
> > This patchset is not about IPIs at all. It is about interrupts coming from
> > IO-APICs.
> 
> Ah, you mean io-apic here. I'll try to find some time tonight/tomorrow-morning
> for review. Thanks!

Sorry for delay, Alexander. I can only review the code (I've no x2apic
testing machine at the moment) and it looks good for me.

Reviewed-by: Cyrill Gorcunov <gorcunov@...nvz.org>

p.s. Hope Suresh and Yinghai will take a look too. The thing which bothers
me is that we use LowPrio delivery mode, while there is no lowprio in
x2apic ipi messages and I assume the same should apply to ioapic generated
messages.

	Cyrill
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