Date: Sat, 24 Dec 2011 22:12:42 +1100 (EST) From: Bruce Evans <brde@optusnet.com.au> To: Alexander Best <arundel@freebsd.org> Cc: freebsd-current@freebsd.org, freebsd-arch@freebsd.org Subject: Re: [rfc] removing -mpreferred-stack-boundary=2 flag for i386? Message-ID: <20111224220705.H2059@besplex.bde.org> In-Reply-To: <20111224091250.GA9921@freebsd.org> References: <20111223235642.GA37495@freebsd.org> <20111224160050.T1141@besplex.bde.org> <20111224091250.GA9921@freebsd.org>
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On Sat, 24 Dec 2011, Alexander Best wrote: > On Sat Dec 24 11, Bruce Evans wrote: >> On Fri, 23 Dec 2011, Alexander Best wrote: >> >>> is -mpreferred-stack-boundary=2 really necessary for i386 builds any >>> longer? >>> i built GENERIC (including modules) with and without that flag. the results >>> are: >> >> The same as it has always been. It avoids some bloat. >> >>> 1654496 bytes with the flag set >>> vs. >>> 1654952 bytes with the flag unset >> >> I don't believe this. GENERIC is enormously bloated, so it has size >> more like 16MB than 1.6MB. Even a savings of 4K instead of 456 bytes > > i'm sorry. i used du(1) to get those numbers, so i believe those numbers > represent the ammount of 512-byte blocks. if i'm correct GENERIC is even > more bloated than you feared and almost reaches 1GB: > > 807,859375 megabytes with flag set > vs. > 808,0820313 megabytes without the flag set That's certainly bloated. It counts all object files and modules, and probably everything is compiled with -g. I only counted kernel text size. Bruce
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