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Subject: RE: [PATCH] ia64: change defconfig to NR_CPUS==1024
Date: Fri, 6 Jan 2006 09:19:28 -0800
Message-ID: <B8E391BBE9FE384DAA4C5C003888BE6F055A7AFB@scsmsx401.amr.corp.intel.com>
Thread-Topic: [PATCH] ia64: change defconfig to NR_CPUS==1024
Thread-Index: AcYSnQDY8o1DS5mGTsSopAjjLnXqOwAR5wlA
From: "Luck, Tony" <tony.luck@intel.com>
To: "Arjan van de Ven" <arjan@infradead.org>, <hawkes@sgi.com>
Cc: "Tony Luck" <tony.luck@gmail.com>, "Andrew Morton" <akpm@osdl.org>,
       <linux-ia64@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
       "Jack Steiner" <steiner@sgi.com>, "Dan Higgins" <djh@sgi.com>,
       "John Hesterberg" <jh@sgi.com>, "Greg Edwards" <edwardsg@sgi.com>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1041
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>> Increase the generic ia64 config from its current max of 512 CPUs to a
>> new max of 1024 CPUs.
>
>I wonder why this would be seen as a sane thing...
>Very few people have 1024 cpus, and the ones that do sure would know how
>to set 1024 in their kernel config. In fact I would argue to lower it. I
>can see the point of keeping it over 64, to give the
>more-cpus-than-a-long code more testing, but 512 is too high already..
>most people who have ia64 will not have 512 cpus.

Would it be impossibly hard to make the >64 cpus case (when the code
switches from a single word to an array) be dependent on a boot-time
variable?  If we could, then the defconfig could just say 128, and
users of monster machines would just boot with "maxcpus=4096" to increase
the size of the bitmask arrays.

-Tony
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