From: Paul Mackerras <paulus@cs.anu.edu.au>
To: rth@cygnus.com
Cc: Jes.Sorensen@cern.ch, Geert.Uytterhoeven@cs.kuleuven.ac.be,
linuxppc-dev@lists.linuxppc.org, linux-fbdev@vuser.vu.union.edu
Subject: Re: [linux-fbdev] Re: readl() and friends and eieio on PPC
Date: Thu, 12 Aug 1999 15:00:46 +1000 [thread overview]
Message-ID: <199908120500.PAA30022@tango.anu.edu.au> (raw)
In-Reply-To: <19990811214049.A14692@cygnus.com> (message from Richard Henderson on Wed, 11 Aug 1999 21:40:49 -0700)
Richard Henderson <rth@cygnus.com> wrote:
> But it isn't zero cost. It's not high cost, but that's not the same
> thing.
Show us the numbers?
I'm starting to sound like Larry McVoy, I know. :-)
The measurements I did showed no measurable difference in performance
for copying stuff around a framebuffer on PPC (Richard, I guess you
may not have seen that post). As far as PPC is concerned, I am
unwilling to break drivers for the sake of an infinitesimal
performance gain. I don't believe the frame-buffer guys will actually
see any measurable improvement in performance from taking out the
eieio from readl/writel on PPC.
Of course, it may be different on alpha, and I would be very
interested to know how big the effect is there.
Paul.
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next prev parent reply other threads:[~1999-08-12 5:00 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-08-09 8:17 readl() and friends and eieio on PPC Geert Uytterhoeven
1999-08-09 17:19 ` David A. Gatwood
1999-08-10 1:00 ` Paul Mackerras
1999-08-10 7:18 ` [linux-fbdev] " Jes Sorensen
1999-08-11 0:23 ` Paul Mackerras
1999-08-11 7:23 ` Jes Sorensen
1999-08-11 7:38 ` Richard Henderson
1999-08-12 0:13 ` Paul Mackerras
1999-08-12 1:39 ` Peter Chang
1999-08-12 4:52 ` Paul Mackerras
1999-08-12 6:17 ` Peter Chang
1999-08-12 0:17 ` Paul Mackerras
1999-08-12 4:40 ` Richard Henderson
1999-08-12 5:00 ` Paul Mackerras [this message]
1999-08-12 5:43 ` Richard Henderson
1999-08-12 7:07 ` Paul Mackerras
1999-08-12 7:33 ` Richard Henderson
1999-08-12 9:58 ` Paul Mackerras
1999-08-12 12:31 ` Geert Uytterhoeven
1999-08-13 12:18 ` Paul Mackerras
1999-08-18 11:02 ` Gabriel Paubert
1999-08-13 18:33 ` Richard Henderson
1999-08-12 5:16 ` David Edelsohn
1999-08-12 5:27 ` Paul Mackerras
1999-08-12 5:52 ` Richard Henderson
1999-08-12 7:11 ` Paul Mackerras
1999-08-12 7:32 ` Jes Sorensen
1999-08-11 23:52 ` Paul Mackerras
1999-08-12 7:38 ` Jes Sorensen
1999-08-12 19:00 ` David A. Gatwood
1999-08-13 1:51 ` Paul Mackerras
[not found] <Pine.LNX.3.96.990813143741.27557B-100000@mvista.com>
[not found] ` <d3so5mdyta.fsf@lxp03.cern.ch>
1999-08-14 18:34 ` Geert Uytterhoeven
1999-08-14 18:36 ` David A. Gatwood
1999-08-14 19:48 ` Jes Sorensen
1999-08-15 1:28 ` David A. Gatwood
1999-08-14 21:39 ` Richard Henderson
1999-08-15 23:16 ` Paul Mackerras
1999-08-16 0:29 ` Richard Henderson
1999-08-16 7:11 ` Jes Sorensen
[not found] <m3672hkxri.fsf@soma.andreas.org>
1999-08-15 13:39 ` James Simmons
[not found] <d3pv0p72yr.fsf@lxp03.cern.ch>
1999-08-15 19:43 ` David A. Gatwood
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