*BSD News Article 78287


Return to BSD News archive

Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!news.mira.net.au!vic.news.telstra.net!act.news.telstra.net!psgrain!news.sprintlink.net!news-stk-11.sprintlink.net!news1.sunbelt.net!mel.hargray.com!pull-feed.internetmci.com!newsfeed.internetmci.com!howland.erols.net!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!psinntp!psinntp!interramp.com!usenet
From: dcmyers@access.digex.net
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: gcc optimizations for kernel
Date: 14 Sep 1996 01:06:24 GMT
Organization: PSINet
Lines: 15
Sender: myers@freebsd.interramp.com (David C. Myers)
Message-ID: <51d0eg$9uf@usenet4.interramp.com>
NNTP-Posting-Host: 38.12.171.120
X-Newsreader: knews 0.9.6



Following up on a comment made in the "Benchmarking different UNIX systems"
thread, I'd like to know what the best gcc optimizations are for a FreeBSD
kernel running on a Pentium.  For example, I noticed that the default
Makefile uses plain ol' -O, as opposed to -O2 or -O3.  Is it safe to
turn on the higher optimization levels?  And what sort of performance
increase has been measured?  I'd happily trade a few tens of kilobytes
of kernel size for better performance...

Any suggestions welcome.  Thanks.

-David.