Date: Tue, 19 Jul 2011 03:07:36 +0200 From: Attilio Rao <attilio@freebsd.org> To: "Jayachandran C." <c.jayachandran@gmail.com> Cc: Warner Losh <imp@freebsd.org>, freebsd-mips@freebsd.org Subject: Re: Bumping MAXCPU for MIPS configurations Message-ID: <CAJ-FndAj1j7YN2YqdxMd%2BvjiEhyqp=SedXg5HMHgV--6nSU5kg@mail.gmail.com> In-Reply-To: <BANLkTikF8MRXV7sajRZCg_Va4JbvsepnYw@mail.gmail.com> References: <BANLkTima1XC-K0d2gY=hRSb1BGE_TX2rZw@mail.gmail.com> <BANLkTik%2Bhz-S=umvmy99SScypNg8JFfRWg@mail.gmail.com> <BANLkTimiayq1yExjLSobDhHK0mSAOdXkKA@mail.gmail.com> <BANLkTikF8MRXV7sajRZCg_Va4JbvsepnYw@mail.gmail.com>
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2011/7/3 Jayachandran C. <c.jayachandran@gmail.com>: > 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> wrot= e: >>>> [ 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. =C2=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. So what do you think about this patch?: http://www.freebsd.org/~attilio/maxcpu_bump.diff I already got Marcel's approval on ia64 part, but I need you review the mips bits. Thanks, Attilio --=20 Peace can only be achieved by understanding - A. Einstein
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