Andrew P. wrote:
On 9/22/05, jason <[EMAIL PROTECTED]> 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 = "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 "[EMAIL PROTECTED]"
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
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=pentium4 -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=sse" 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.html#i386-and-x86_002d64-Options
it will have everything, I hope, you need to know.
_______________________________________________
freebsd-questions@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-questions
To unsubscribe, send any mail to "[EMAIL PROTECTED]"
