linux-kernel - RE: [PATCH RFC] [X86] Compile Option Os versus O2 on latest x86 platform

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Date:	Thu, 3 Dec 2009 23:03:15 +0800
From:	"Ma, Ling" <ling.ma@...el.com>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	Ingo Molnar <mingo@...e.hu>, Dave Jones <davej@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH RFC] [X86] Compile Option Os versus O2 on latest x86
 platform

> a key question is.. how much more memory do you have free due to -Os?
> (because memory is cache is performance on a system level as well)
The kernel code size from Os is 12M, that from O2 is 14M.
> and how much less icache pressure is there?
>From perf stat report, cache reference(unified cache) from O2 is almost the same with Os.

Thanks
Ling 

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