Re: Poor performance of G5 on GNOME's CPU benchmarks.

To: Charles Plessy <plessy@debian.org>
Cc: debian-powerpc@lists.debian.org
Subject: Re: Poor performance of G5 on GNOME's CPU benchmarks.
From: Christian Jaeger <christian@jaeger.mine.nu>
Date: Mon, 01 Sep 2008 21:32:08 +0200
Message-id: <[🔎] 48BC4338.70409@jaeger.mine.nu>
In-reply-to: <48A79983.4080104@jaeger.mine.nu>
References: <20080803025302.GB14414@kunpuu.plessy.org> <1217777546.6019.429.camel@thor.sulgenrain.local> <20080804012443.GA6384@kunpuu.plessy.org> <1217841002.6019.524.camel@thor.sulgenrain.local> <20080805141715.GA15972@kunpuu.plessy.org> <1217946387.6019.642.camel@thor.sulgenrain.local> <20080811121737.GA13660@kunpuu.plessy.org> <48A798B9.9040302@jaeger.mine.nu> <48A79983.4080104@jaeger.mine.nu>

PS. just tripped over this:

http://math-atlas.sourceforge.net/errata.html

Gcc 4.2 is has a performance bug that normally cuts performance inhalf. ATLAS works around this by throwing the flags:
   -fno-schedule-insns -fno-rerun-loop-opt


Maybe you're seeing this issue.

Christian.

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