Date: 04 Apr 98 11:31:29 +0330 From: "Muthu" <MOLAGAPP.IN.oracle.com.ofcmail@in.oracle.com> To: hackers@FreeBSD.ORG Subject: Fwd: bcopy implementation Message-ID: <199804040743.CAA11904@dwarpal.in.oracle.com>
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Date: 03 Apr 98 18:28:31
From:"Muthu" <MOLAGAPP.IN.ORACLE.COM>
To:owner-freebsd-hackers@freebsd.org
Subject:Re: bcopy implementation
X-Orcl-Application:In-Reply-To: INUNIX2.IN.ORACLE.COM:owner-freebsd-hackers@freebsd.org's message of 02-Apr-98 21:16
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Hi,
I am attempting to optimize the libc for pentium processor. Is anybody
attempting this work?
The bcopy implementation in libc gives 100% performance improvement on Dell
machines. But as Compaq Deskpro machine is concerned, this implementation
degrades the performance. Do any one have idea why such a difference in the
two machines? Both Dell and Compaq deskpro has pentium processor.
Regards,
Muthu. O.L.
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Date: 03 Apr 98 17:50:08
From:"Mikael Karpberg <karpen@ocean.campus.luth.se>" <owner-freebsd-hackers@freebsd.org>
To:marquard@zilker.net,(Dave,Marquardt)
Subject:Re: bcopy implementation
Cc:freebsd-hackers@freebsd.org
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In-Reply-To:<857m57c8tr.fsf@localhost.zilker.net> from Dave Marquardt at "Apr 3, 98 07:51:12 am"
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According to Dave Marquardt:
> > of not implementing this method in libc?
>
> Well, you said it yourself. "On the assumption, that the system has
> pentium processor...." Well, we can't assume that, since FreeBSD runs
> on 386s and up.
Well, if you want everything to go faster, you optimize for the hardware
you're actually gonna run on. Now, it would be quite possible too add
ifdefs so that you would add -DOPTIMIZE_FOR_PENTIUM to CFLAGS in make.conf
and then make world. And libc would be compiled with that optimization, etc.
/Mikael
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