Date: Fri, 19 Mar 2010 09:12:00 -0700 From: Xin LI <delphij@delphij.net> To: John Baldwin <jhb@freebsd.org> Cc: d@delphij.net, freebsd-arch@freebsd.org Subject: Re: [PATCH] Utilize i686, SSE and MMX by default on FreeBSD/i386 Message-ID: <4BA3A250.2080204@delphij.net> In-Reply-To: <201003190751.26767.jhb@freebsd.org> References: <4BA2CE17.2050105@delphij.net> <201003190751.26767.jhb@freebsd.org>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 2010/03/19 04:51, John Baldwin wrote: > 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. Yes you are right. Sorry for the confusion. Cheers, - -- Xin LI <delphij@delphij.net> http://www.delphij.net/ FreeBSD - The Power to Serve! Live free or die -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (FreeBSD) iQEcBAEBAgAGBQJLo6JPAAoJEATO+BI/yjfBVZ4IAIcyFNbDKwtpKQyU9xg5T9B1 JeJXA7pyMnb5YydJy5KR/Kw5RTpRoMzp64CuMDfBLH1oEbxHaFGGlwqm+qwNnk2S a1CraA/9vmr4oOZbIso6jAhEBet1l8+O6hcMfhs9+8LnZpgkUbhikYOABQwVRaw7 xhMQYaEXseB5rltavgqlSQcDlmS3mctuyBuS1KGa0ONGxt4dT5giEWcmpvruouF9 MyGsElWA7iUW2c1EjPywGlPW3M2pSdzaIySDK4eE4w1jmtjl+gzQ0TMNdcNVpGo7 jKb4eZD1oxLAg5ljxbRQCTeK199TNPBYktAnaiIZa/FEDa7cHGURf7EsipDkTv4= =0n/e -----END PGP SIGNATURE-----
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