Date: Mon, 12 Apr 2010 08:00:23 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Andriy Gapon <avg@icyb.net.ua> Cc: Maho NAKATA <chat95@mac.com>, freebsd-stable@freebsd.org Subject: Re: Only 70% of theoretical peak performance on FreeBSD 8/amd64, Corei7 920 Message-ID: <20100412150023.GA80292@icarus.home.lan> In-Reply-To: <4BC3311F.5060503@icyb.net.ua> References: <20100412.131213.4959786962516027.chat95@mac.com> <4BC3311F.5060503@icyb.net.ua>
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On Mon, Apr 12, 2010 at 05:41:35PM +0300, Andriy Gapon wrote: > Perhaps, he talks about support of large pages (2M) and related improvements in > TLB performance. If so, he (and you) may read about 'superpages' feature of FreeBSD. > I am not sure if it is enabled by default in 8.0, you can check vm.pmap.pg_ps_enabled. On 8.0-RELEASE and later, they are. Line 183: http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/amd64/amd64/pmap.c?annotate=1.667.2.12 Commit where they got enabled by default (approx. 16 months ago): http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/amd64/amd64/pmap.c#rev1.646 -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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