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Date: Wed, 19 Dec 2001 11:56:16 -0600
From: "M. R. Brown" <mrbrown@0xd6.org>
To: Benoit Poulot-Cazajous <poulot@ifrance.com>
Cc: nbecker@fred.net, linux-kernel@vger.kernel.org
Subject: Re: On K7, -march=k6 is good (Was Re: Why no -march=athlon?)
Message-ID: <20011219175616.GD19236@0xd6.org>
In-Reply-To: <x88r8ptki37.fsf@rpppc1.hns.com> <20011217174020.GA24772@0xd6.org> <lnitb3drx6.fsf_-_@walhalla.agaha>
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* Benoit Poulot-Cazajous <poulot@ifrance.com> on Wed, Dec 19, 2001:

>=20
> But gcc-2.95,x _supports_ "-march=3Dk6", and we should use that instead of
> "-march-i686".
>=20

No, k6 !=3D athlon.  IIRC, the i686 optimization is closer to the Athlon th=
an
the k6 opt.

>=20
> before the patch :
> 1017.92user 261.80system 24:39.89elapsed 86%CPU
> 706.33user 160.79system 16:23.61elapsed 88%CPU
> 1787.38user 418.76system 43:35.97elapsed 84%CPU
>=20
> after the patch :
> 1018.42user 253.85system 24:44.68elapsed 85%CPU
> 704.89user 151.76system 16:16.14elapsed 87%CPU
> 1786.96user 410.76system 43:05.32elapsed 85%CPU
>=20
> The improvement in system time is nice.
>=20

Er, there's not much difference...

Curious, what happens when you compile using gcc 3.0.1 against
-march=3Dathlon?

M. R.

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