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Message-ID: <m21v1x91df.fsf@firstfloor.org> Date: Wed, 23 Mar 2011 10:45:48 -0700 From: Andi Kleen <andi@...stfloor.org> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Ingo Molnar <mingo@...e.hu>, Pekka Enberg <penberg@...nel.org>, Jesper Juhl <jj@...osbits.net>, linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Daniel Lezcano <daniel.lezcano@...e.fr>, Eric Paris <eparis@...hat.com>, Roman Zippel <zippel@...ux-m68k.org>, linux-kbuild@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org> Subject: Re: PATCH][RFC][resend] CC_OPTIMIZE_FOR_SIZE should default to N Linus Torvalds <torvalds@...ux-foundation.org> writes: > On Tue, Mar 22, 2011 at 3:27 AM, Ingo Molnar <mingo@...e.hu> wrote: >> >> If that situation has changed - if GCC has regressed in this area then a commit >> changing the default IMHO gains a lot of credibility if it is backed by careful >> measurements using perf stat --repeat or similar tools. > > Also, please don't back up any numbers for the "-O2 is faster than > -Os" case with some benchmark that is hot in the caches. Haven't done it recently, but some time last year -O2 vs -Os made a measurable difference in large OLTP benchmarks. (-Os being worse of course -- friends don't let friends use -Os) -Andi -- ak@...ux.intel.com -- Speaking for myself only -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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