From: Ingo Molnar <mingo@elte.hu>
To: Jack Steiner <steiner@sgi.com>
Cc: tglx@linutronix.de, linux-kernel@vger.kernel.org,
"H. Peter Anvin" <hpa@zytor.com>,
Yinghai Lu <yhlu.kernel@gmail.com>
Subject: Re: [PATCH] - UV fix for size of hub mappings
Date: Sat, 27 Sep 2008 22:02:14 +0200 [thread overview]
Message-ID: <20080927200214.GB28937@elte.hu> (raw)
In-Reply-To: <20080927195615.GA244243@sgi.com>
* Jack Steiner <steiner@sgi.com> wrote:
> > x2apic support is available in tip/master, so it would be nice to
> > glue UV to generic x2apic support properly and remove duplication
> > and fixmes.
>
> Good point. I'll send the fixes to you early next week. Recently, I've
> been focused on a distro release which is still waiting for the x2apic
> code. However, I don't need to wait to fix this upstream...
great!
> > For example, do we really need apic_x2apic_uv_x, or could we use
> > apic_x2apic_cluster?
>
> Unfortunately, we really need a uv genapic. IPIs on large UV systems
> can't use an x2apic model. Because of the size of our large systems,
> APICIDs in the cpu MSRs are not globally unique. We have a special
> feature in the UV chipset that must be used for on large systems for
> IPIs. Small & medium sized system can and do use the x2apic genapic.
not a problem really - it's not really complex or intrusive, we just
want to make sure all unnecessary duplication is eliminated.
Ingo
prev parent reply other threads:[~2008-09-27 20:02 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-25 12:52 Jack Steiner
2008-09-27 17:42 ` Ingo Molnar
2008-09-27 19:56 ` Jack Steiner
2008-09-27 20:02 ` Ingo Molnar [this message]
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