Date: Wed, 22 Sep 2010 15:16:45 +0400 From: pluknet <pluknet@gmail.com> To: Maxim Sobolev <sobomax@freebsd.org> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org>, Jeff Roberson <jeff@freebsd.org>, "current@freebsd.org" <current@freebsd.org> Subject: Re: Bumping MAXCPU on amd64? Message-ID: <AANLkTikYo8zyHBHtuo2knTUeb0RhyiQ--RE=jNx2wADW@mail.gmail.com> In-Reply-To: <4C99DC48.1020208@FreeBSD.org> References: <4C99DC48.1020208@FreeBSD.org>
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2010/9/22 Maxim Sobolev <sobomax@freebsd.org>: > Hi, > > Is there any reason to keep MAXCPU at 16 in the default kernel config? There > are quite few servers on the market today that have 24 or even 32 physical > cores. With hyper-threading this can even go as high as 48 or 64 virtual > cpus. People who buy such hardware might get very disappointed finding out > that the FreeBSD is not going to use such hardware to its full potential. > > Does anybody object if I'd bump MAXCPU to 32, which is still low but might > me more reasonable default these days, or at least make it an kernel > configuration option documented in the NOTES? Please correct me, if I'm about smth. different, but isn't it already? /sys/amd64/include/param.h:#define MAXCPU 32 /sys/arm/include/param.h:#define MAXCPU 2 /sys/i386/include/param.h:#define MAXCPU 32 /sys/ia64/include/param.h:#define MAXCPU 32 /sys/mips/include/param.h:#define MAXCPU MAXSMPCPU /sys/powerpc/include/param.h:#define MAXCPU 2 /sys/sparc64/include/param.h:#define MAXCPU 16 /sys/sun4v/include/param.h:#define MAXCPU 32 (almost 2y ago for x86) -- wbr, pluknet
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