Date: Fri, 23 Sep 2005 23:44:15 +0400 From: "Andrew P." <infofarmer@gmail.com> To: jason <jason@ec.rr.com> Cc: questions@freebsd.org Subject: Re: AMD Sempron CPUTYPE & Co. Message-ID: <cb5206420509231244338e16ea@mail.gmail.com> In-Reply-To: <433369DD.1020608@ec.rr.com> References: <cb520642050920132154c9fe@mail.gmail.com> <43325422.2070308@ec.rr.com> <cb52064205092200237cc896ba@mail.gmail.com> <433369DD.1020608@ec.rr.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On 9/23/05, jason <jason@ec.rr.com> wrote: > Andrew P. wrote: > > >On 9/22/05, jason <jason@ec.rr.com> wrote: > > > > > >>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 =3D "AuthenticAMD" Id =3D 0x20fc2 Stepping =3D 2 > >>> > >>> Features=3D0x78bfbff<FPU,VME,DE,PSE,TSC,MSR, > >>>PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV, > >>>PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2> > >>> Features2=3D0x1<SSE3> > >>> AMD Features=3D0xe2500800<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@freebs= d.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 t= o > >>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 > >> > >> > > > >I run FreeBSD/i386, not amd64. > > > >make.conf, gcc and cpp manpages tell you nothing about > >the subj. I roamed mailing lists for a few hours and settled on > >adding "-march=3Dpentium4 -msse3" to CFLAGS and COPTFLAGS. > >I didn't do any serious benchmarking, but the `top` output feels > >like sshd got 2-3% performance boost. Will try to recompile > >with "-mfpmath=3Dsse" later. > > > >Also, I tried forwarding X11 over network without SSH, and > >some things kept lagging. My guess is network connection > >and my solution is a Gigabit switch; the funny thing is that > >I have Gb NICs in most of my PCs, but I still use a 100Mb > >switch. > > > > > > > Hmm, that sucks. The K8 core in 32bit mode. I have heard of native 32 > bit semprons, is that what you have? > > Well check this man page > http://gcc.gnu.org/onlinedocs/gcc-3.4.4/gcc/i386-and-x86_002d64-Options.h= tml#i386-and-x86_002d64-Options > > it will have everything, I hope, you need to know. > Native 32-bit mode? All AMD Athlon64/Sempron/Opteron CPUs support 32-bit mode quite natively. As for Semprons - there are some called "64-bit enabled". I have one of those. Thanks very much for the link. I put some knobs into my make.conf file - but it's not just that easy, no. Some apps do not like the newer knobs like -msse3, so I have yet to come up with a better solution than to edit make.conf before each build.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?cb5206420509231244338e16ea>