Date: Sat, 24 May 2014 11:38:35 +0100 From: Tim Bishop <tim-lists@bishnet.net> To: Alan Somers <asomers@freebsd.org> Cc: FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: Processor cores not properly detected/activated? Message-ID: <20140524103835.GI13462@carrick-users.bishnet.net> In-Reply-To: <CAOtMX2hnQNhb%2BaGPogTMwxnVVKuuz3Buq1Cb3xBPYW7p7M8=Tw@mail.gmail.com> References: <20140524014713.GF13462@carrick-users.bishnet.net> <CAOtMX2gyeLYs4nAKOa-u=PQ63TakreG0CW_Fc%2BRrdDv8NtZ3XQ@mail.gmail.com> <20140524024231.GG13462@carrick-users.bishnet.net> <CAOtMX2hnQNhb%2BaGPogTMwxnVVKuuz3Buq1Cb3xBPYW7p7M8=Tw@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Fri, May 23, 2014 at 09:03:12PM -0600, Alan Somers wrote: > 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. I submitted a PR to that effect: http://www.freebsd.org/cgi/query-pr.cgi?pr=190169 Thanks again for your help. Tim. -- Tim Bishop http://www.bishnet.net/tim/ PGP Key: 0x6C226B37FDF38D55
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20140524103835.GI13462>