Date: Wed, 29 Jun 2011 13:18:24 +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: <BANLkTimiayq1yExjLSobDhHK0mSAOdXkKA@mail.gmail.com> In-Reply-To: <BANLkTik%2Bhz-S=umvmy99SScypNg8JFfRWg@mail.gmail.com> References: <BANLkTima1XC-K0d2gY=hRSb1BGE_TX2rZw@mail.gmail.com> <BANLkTik%2Bhz-S=umvmy99SScypNg8JFfRWg@mail.gmail.com>
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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. =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? > Each XLP SoC has built-in memory controllers, network accelerator, > PCIe, UARTs, USB etc., so ideally we want to be NUMA aware rather than > doing straight SMP across all the chips. But this is an area I have > not looked into yet. This is an area which should still improve a lot. So far we have only a very basic support for NUMA, with dummy logic. Thanks, Attilio --=20 Peace can only be achieved by understanding - A. Einstein
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