Only 70% of theoretical peak performance on FreeBSD 8/amd64, Corei7 920

[Jeremy Chadwick]

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 at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |