Date: Tue, 19 Jul 2011 09:16:12 +0530 From: "Jayachandran C." <c.jayachandran@gmail.com> To: Attilio Rao <attilio@freebsd.org> Cc: Warner Losh <imp@freebsd.org>, freebsd-mips@freebsd.org Subject: Re: Bumping MAXCPU for MIPS configurations Message-ID: <CA%2B7sy7BGE0u35oohnBViiYTGUqGybtNVCY_pJxVcY8RhUzwmpA@mail.gmail.com> In-Reply-To: <CAJ-FndAj1j7YN2YqdxMd%2BvjiEhyqp=SedXg5HMHgV--6nSU5kg@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> <CAJ-FndAj1j7YN2YqdxMd%2BvjiEhyqp=SedXg5HMHgV--6nSU5kg@mail.gmail.com>
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On Tue, Jul 19, 2011 at 6:37 AM, Attilio Rao <attilio@freebsd.org> wrote: > 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> wro= te: >>>>> [ 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 wan= t >>>>> 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. > > 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. For the XLP changes, we don't really need 128 for MAXCPU now. The ICI interface driver which is needed to connect multiple XLPs together to get 64/128 cpus have not been checked in yet. I plan to do this a few months down the line. Regards, JC.
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