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Date: Sun, 3 Jul 2011 04:07:04 +0530
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From: "Jayachandran C." <c.jayachandran@gmail.com>
To: Attilio Rao <attilio@freebsd.org>
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Cc: Warner Losh <imp@freebsd.org>, freebsd-mips@freebsd.org
Subject: Re: Bumping MAXCPU for MIPS configurations
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On Wed, Jun 29, 2011 at 4:48 PM, Attilio Rao <attilio@freebsd.org> wrote:
> 2011/6/29 Jayachandran C. <c.jayachandran@gmail.com>:
>> On Wed, Jun 29, 2011 at 3:10 PM, Attilio Rao <attilio@freebsd.org> wrote=
:
>>> [ Please CC me in replies as I'm not subscribed to this mailing list ]
>>>
>>> I'm planning to bump MAXCPU for all the kernel configurations
>>> requiring it, as long as the latest cut of largeSMP changes is
>>> completed.
>>>
>>> Anyway, I'm not really sure what MIPS configurations may benefit from
>>> a larger number of MAXCPU. Probabilly XLP should, for what I've heard,
>>> but I'd like to get a precise mapping between configurations that want
>>> to bump the number and the actual maximum number of CPUs to be
>>> supported.
>>
>> An XLP SoC has 32 cpus (8cores x 4 hw threads per core), and 4 of
>> these can be interconnected to have upto 128 cpus. =A0We have an XLP
>> port running on one chip with 32cpus, but there is interest in trying
>> out 2 chip (64cpus) and 4 chip(128 cpus) configurations, so this is
>> something I want to do when I get access to multi-chip boards for
>> FreeBSD development.
>
> I'll bump MAXCPU to 128 for XLP then, thanks.
> Do you have informations about XLR?

For XLR the the MAXCPU should be 32 (8 cores x 4 threads per core on
the SoC). We cannot connect multiple chips together like the XLP.

JC.