Date: Mon, 4 Jul 2005 09:25:27 +0200 From: Simon 'corecode' Schubert <corecode@fs.ei.tum.de> To: Nikos Ntarmos <ntarmos@ceid.upatras.gr> Cc: hackers@freebsd.org, andrit@ukr.net Subject: Re: hot path optimizations in uma_zalloc() & uma_zfree() Message-ID: <20050704092527.694c3057.corecode@fs.ei.tum.de> In-Reply-To: <20050704010908.GA17696@diogenis.ceid.upatras.gr> References: <000d01c57cf7$b9b6f9f0$29931bd9@ertpc> <20050630163126.GA7365@diogenis.ceid.upatras.gr> <001401c57ef0$dd489720$34bf5450@ertpc> <20050704010908.GA17696@diogenis.ceid.upatras.gr>
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--Signature=_Mon__4_Jul_2005_09_25_27_+0200_9=zCeoo/_5gB51gV Content-Type: text/plain; charset=US-ASCII Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Lately Nikos Ntarmos <ntarmos@ceid.upatras.gr> said: > Ummm... What compiler version are you use? The pointer variant produces > faster code for me on both NetBSD/alpha (gcc 3.3.3) and Linux/x86 (gcc > 3.3.5), using both -O0 and -O2 (other compiler flags also tested with > similar results). Perhaps something specific to FreeBSD then? I guess > I'll have to set up a FBSD box and have a look at it, when I catch up > with some of the other stuff in my todo list... This is micro-optimization at its best. I doubt it has any influence in real world scenarios. And if it does, something else is extremely broken. You don't want to takt the route and implement it in assembler? Besides, I guess it's totally CPU dependant, how stuff can be pipelined, all memory locations ought to be in the cache anyways. cheers simon --=20 Serve - BSD +++ RENT this banner advert +++ ASCII Ribbon /"\ Work - Mac +++ space for low $$$ NOW!1 +++ Campaign \ / Party Enjoy Relax | http://dragonflybsd.org Against HTML \ Dude 2c 2 the max ! http://golden-apple.biz Mail + News / \ --Signature=_Mon__4_Jul_2005_09_25_27_+0200_9=zCeoo/_5gB51gV Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (DragonFly) iD8DBQFCyORsr5S+dk6z85oRAj0WAJ9AHFKz3lccxKIvZczxtCh3GMVIJwCg11iT WTkjSYfDvzorUtlYglOob7w= =3Vev -----END PGP SIGNATURE----- --Signature=_Mon__4_Jul_2005_09_25_27_+0200_9=zCeoo/_5gB51gV--
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