Date: Fri, 23 May 2014 21:03:12 -0600 From: Alan Somers <asomers@freebsd.org> To: Tim Bishop <tim-lists@bishnet.net> Cc: FreeBSD CURRENT <freebsd-current@freebsd.org>, Alan Somers <asomers@freebsd.org> Subject: Re: Processor cores not properly detected/activated? Message-ID: <CAOtMX2hnQNhb%2BaGPogTMwxnVVKuuz3Buq1Cb3xBPYW7p7M8=Tw@mail.gmail.com> In-Reply-To: <20140524024231.GG13462@carrick-users.bishnet.net> References: <20140524014713.GF13462@carrick-users.bishnet.net> <CAOtMX2gyeLYs4nAKOa-u=PQ63TakreG0CW_Fc%2BRrdDv8NtZ3XQ@mail.gmail.com> <20140524024231.GG13462@carrick-users.bishnet.net>
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On Fri, May 23, 2014 at 8:42 PM, Tim Bishop <tim-lists@bishnet.net> wrote: > On Fri, May 23, 2014 at 08:07:03PM -0600, Alan Somers wrote: >> On Fri, May 23, 2014 at 7:47 PM, Tim Bishop <tim-lists@bishnet.net> wrote: >> > I have a new quad CPU system containing four of these processors: >> > >> > Intel(R) Xeon(R) CPU E7-4830 v2 @ 2.20GHz (2200.05-MHz K8-class CPU) >> > >> > I've tried FreeBSD 10.0, stable/10 and head, but all of them only detect >> > a maximum of 64 "CPUs". There should be 80. Here's the relevant dmesg >> > output (full output attached): >> > >> > FreeBSD/SMP: Multiprocessor System Detected: 64 CPUs >> > FreeBSD/SMP: 3 package(s) x 10 core(s) x 2 SMT threads >> > ... >> >> Try setting MAXCPU higher. It's defined by default to 64 in, >> sys/amd64/include/param.h > > Ah! Thank you, yes, that fixed it: > > FreeBSD/SMP: Multiprocessor System Detected: 80 CPUs > FreeBSD/SMP: 4 package(s) x 10 core(s) x 2 SMT threads > > Given the number of "CPUs" in some top end processors (up to 30 per > socket), a limit of 64 is starting to seem low. Is it worth doubling it > to 128? Or even higher? Yeah, I think so. It seems like a GENERIC kernel ought to be able to handle the biggest commonly available quad socket systems. Anything with more than 4 sockets, though, is probably too exotic to deserve such special treatment. > > It'd be nice to be able to use a stock kernel with freebsd-update at > least. > > Anyway, thanks for your help Alan, at least my system is working fully > now :-) > > Tim. > > -- > Tim Bishop > http://www.bishnet.net/tim/ > PGP Key: 0x6C226B37FDF38D55 >
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