Date: Tue, 19 Jul 2011 18:03:37 +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%2B7sy7A-ysW9pfwF7kq6NZr7Cu_JDWWMxC7nrV_zQwaO2QoiTw@mail.gmail.com> In-Reply-To: <CAJ-FndBF%2B6mCwp6rw5HsqLTBcFJRTSkvFBaTdH=G7CbqAZo3mg@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> <CA%2B7sy7BGE0u35oohnBViiYTGUqGybtNVCY_pJxVcY8RhUzwmpA@mail.gmail.com> <CAJ-FndBF%2B6mCwp6rw5HsqLTBcFJRTSkvFBaTdH=G7CbqAZo3mg@mail.gmail.com>
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On Tue, Jul 19, 2011 at 5:18 PM, Attilio Rao <attilio@freebsd.org> wrote: > 2011/7/19 Jayachandran C. <c.jayachandran@gmail.com>: >> 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> wro= te: >>>>> 2011/6/29 Jayachandran C. <c.jayachandran@gmail.com>: >>>>>> On Wed, Jun 29, 2011 at 3:10 PM, Attilio Rao <attilio@freebsd.org> w= rote: >>>>>>> [ Please CC me in replies as I'm not subscribed to this mailing lis= t ] >>>>>>> >>>>>>> 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 fr= om >>>>>>> a larger number of MAXCPU. Probabilly XLP should, for what I've hea= rd, >>>>>>> but I'd like to get a precise mapping between configurations that w= ant >>>>>>> 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 tryin= g >>>>>> 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. =A0The ICI >> interface driver which is needed to connect multiple XLPs together to >> get 64/128 cpus have not been checked in yet. =A0I plan to do this a few >> months down the line. > > As I'm going to bump the MAXCPUs for all the architectures now, where > needed, I'm not sure why we should not do that now, even if the full > support is not ready yet. > > If you are strongly against the change I won't commit it, otherwise it > would be good to bump now, along with amd64 and ia64. I have no issues with bumping it up to 128. Thought I would just note that we don't support it yet, and hopefully we can remedy that soon :) JC.
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