From: James Cleverdon <jamesclv@us.ibm.com>
To: "Mika Penttilä" <mika.penttila@kolumbus.fi>,
"Protasevich, Natalie" <Natalie.Protasevich@UNISYS.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/2][2.5]Unisys ES7000 platform subarch
Date: Wed, 11 Jun 2003 14:52:24 -0700 [thread overview]
Message-ID: <200306111452.24518.jamesclv@us.ibm.com> (raw)
In-Reply-To: <3EE75144.4030300@kolumbus.fi>
On Wednesday 11 June 2003 08:56 am, Mika Penttilä wrote:
> Just out of curiosity, what are "Physical Cluster" and "Logical
> Cluster"? This terminology doesn't appear in Intel documentation.
> AFAIK, IPIs are currently always sent using logical destination mode,
> and in your patch ioapic entries have logical mode in cluster case. So
> where does physical cluster come into play?
>
> --Mika
Starting with P4s, Intel has enabled physical interrupts that correctly use
the upper nibble of the destination field when clustered addressing mode is
turned on. Hence the name "Physical Cluster", even if it may not be official
terminology.
--
James Cleverdon
IBM xSeries Linux Solutions
{jamesclv(Unix, preferred), cleverdj(Notes)} at us dot ibm dot com
next prev parent reply other threads:[~2003-06-11 21:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-11 13:42 [PATCH 2/2][2.5]Unisys ES7000 platform subarch Protasevich, Natalie
2003-06-11 15:56 ` Mika Penttilä
2003-06-11 21:52 ` James Cleverdon [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-06-11 16:40 Protasevich, Natalie
2003-06-11 16:52 ` William Lee Irwin III
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