Matthew Dillon wrote: > > :Totally informally, I replaced libc (compiled with -O2) with one compiled > :with -mpentiumpro and -O6, and compiling kdebase seemed to run a bit > :slower (GNU make took longer to traverse directories and egcs took a bit > :longer to run). > : > :> Which leads me to believe that using -Os might be beneficial. > : > :Have you tried anything beyond -O2? > : > :- alex > > There is nothing beyond -O2. Well, there's -O3, which tries to > inline static functions, but that typically isn't beneficial because > it really bloats up the code and subroutine calls on intel cpus are > very fast. > > The only other optimization that might be useful is -fomit-frame-pointer, > but it makes debugging impossible. I don't have oppurtunity to use CURRENT, but on 3.1-RELEASE and 2.2.8 -fomit-frame-pointer applied to kernel compilation leads to system crash. If you want to reproduce this, compile kernel with -O -fomit-frame-pointer, reboot, and try, for example, to build kernel with make -j 16 ;)
> -Matt > Matthew Dillon > <dil...@backplane.com> -- Pavel Narozhniy nic-hdl: PN395-RIPE http://www.sumy.net To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-current" in the body of the message
