Date: Thu, 27 Feb 1997 09:11:08 -0700 From: "Russell L. Carter" <rcarter@consys.com> To: mika ruohotie <bsdhack@shadows.aeon.net> Cc: hfwirth@ping.at (Helmut F. Wirth), freebsd-hackers@freebsd.org Subject: Re: Pentium MMX Extensions, Changes to (g)as and gdb Message-ID: <199702271611.JAA15971@conceptual.com> In-Reply-To: Your message of "Thu, 27 Feb 1997 11:23:10 %2B0200." <199702270923.LAA07796@shadows.aeon.net>
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> > Hello, > > I made some changes to gas and gdb to support the new MMX extensions > > for the Pentium P55C. > > gee, cool. i didnt think we'd something about that this fast... > > what i'm interested in is, does the mmx cpu run normal freebsd any > faster? the 'make world' is probably the only thing one could use > for measuring it in the "reality" level... i would assume just coz of > larger L1 cache it is already faster. > The MMX instructions themselves will not affect the speed of anything resembling a "normal" code. Intel's P5 cpus with MMX run faster because they have a 2x bigger level1 cache and a few of the scheduling enhancements that first showed up in P6. Interestingly, the P6++ cpus with MMX (so-called Pentium II) run slower than P6 at the same clock rate because of the psuedo-on-chip level2 cache. It's conceivable that pd libraries could start showing up that use these instructions in specific assembly coded routines. I like the idea of putting the MMX instructions in though. Russell
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