linux-kernel - Re: [PATCH V2] [x86]: Compiler Option Os is better on latest x86

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Message-ID: <CAOGi=dOdTaZs_KZrNbpFSjzx+evoAA_dL=nGToXBu9bhOB3Rjg@mail.gmail.com>
Date:	Sun, 27 Jan 2013 21:38:13 +0800
From:	Ling Ma <ling.ma.program@...il.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	mingo@...hat.com, tglx@...utronix.de, hpa@...or.com,
	linux-kernel@...r.kernel.org, Ma Ling <ling.ml@...pay.com>
Subject: Re: [PATCH V2] [x86]: Compiler Option Os is better on latest x86

Hi Ingo

Thanks for your correcting.
Because thinking of  most of 32bit CPU belong to low-end CPUs(smaller
cache), they should more  emphasize  i-cache miss, I chose Os for
them.
I will test it and send out result ASAP.

Regards
Ling

2013/1/27, Ingo Molnar <mingo@...nel.org>:
>
> * ling.ma.program@...il.com <ling.ma.program@...il.com> wrote:
>
>> In this version we also append CONFIG_CC_OPTIMIZE_FOR_SIZE for i386.
>
> Were those measurements done on i386 as well? I'd be content
> with keeping the current minimal - and mostly documentary -
> patch that only does this on 64-bit. I just wanted to record the
> current benchmark numbers mostly.
>
> Also see the discussion with Linus - this is by no far an
> unconditionally good option and we'll probably have to wait for
> more GCC action (-Ok or so) before being able to enable size
> optimizations everywhere without unacceptable trade-offs.
>
> Thanks,
>
> 	Ingo
>
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