Date: Fri, 19 Mar 2010 07:51:26 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-arch@freebsd.org, d@delphij.net Subject: Re: [PATCH] Utilize i686, SSE and MMX by default on FreeBSD/i386 Message-ID: <201003190751.26767.jhb@freebsd.org> In-Reply-To: <4BA2CE17.2050105@delphij.net> References: <4BA2CE17.2050105@delphij.net>
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On Thursday 18 March 2010 9:06:31 pm Xin LI wrote: > Hi, > > I think it doesn't really make sense to by default use MACHINE_CPU=i486 > when the kernel is built with SSE by default today. > > Attached patch uses i686 SSE MMX by default, the user can always change > the default setting by overriding CPUTYPE (they have to do it as SSE is > enabled by default for several years). The kernel is only built with support for userland applications using SSE, it does not _use_ SSE. Similarly, the kernel is built with support for PG_NX provided on 64-bit processors, but it does not do so by failing to support older 32-bit processors. I think this change is premature. Users can already set CPUTYPE in make.conf. Also, most modern x86 server-class machines are 64-bit in which case they would be running FreeBSD/amd64 and using SSE already. -- John Baldwin
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