Date: Thu, 22 Sep 2005 02:50:10 -0400 From: jason <jason@ec.rr.com> To: infofarmer@gmail.com Cc: questions@freebsd.org Subject: Re: AMD Sempron CPUTYPE & Co. Message-ID: <43325422.2070308@ec.rr.com> In-Reply-To: <cb520642050920132154c9fe@mail.gmail.com> References: <cb520642050920132154c9fe@mail.gmail.com>
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Andrew P. wrote: >Hello! > >So I have a Sempron 2500+ CPU, one that supports >SSE3. What should I place in my /etc/make.conf? I use >ssh with X11Forward very often, so OpenSSL should >be compiled to be as fast as it can be on this CPU. >Here's a part of dmesg: > >CPU: AMD Sempron(tm) Processor 2500+ >(1407.05-MHz 686-class CPU) >Origin = "AuthenticAMD" Id = 0x20fc2 Stepping = 2 > > Features=0x78bfbff<FPU,VME,DE,PSE,TSC,MSR, >PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV, >PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2> > Features2=0x1<SSE3> > AMD Features=0xe2500800<SYSCALL,NX,MMX+, ><b25>,LM,3DNow+,3DNow> > >I want to use SSE3, but I don't want to set CPUTYPE >to nocona, cause that way compilers won't ever use >AMD features. Is there a way to tell compilers to use >every feature I've got? > > >Thanks very much, >Andrew P. >_______________________________________________ >freebsd-questions@freebsd.org mailing list >http://lists.freebsd.org/mailman/listinfo/freebsd-questions >To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" > > > man make.conf and man gcc You will be limited by the gcc version on FreeBSD. You can use gcc 4 for your apps, and all that SSE and 3DNow stuff is not currently allowed in the kernel. I remember ready, maybe on slashdot, where a man did very little work to do a native port of ssh to native amd64 code and got a hugh speed boost. Making sure you get a optimized version os ssh like what I described will make a much bigger difference than just adding amd64 as your cp type to make.conf. Jason
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