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Subject: Re: [BENCHMARK] gcc3.2 v 2.95.3 (contest and linux-2.5.38)
From: Robert Love <rml@tech9.net>
To: Con Kolivas <conman@kolivas.net>
Cc: linux-kernel@vger.kernel.org
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On Sun, 2002-09-22 at 23:04, Con Kolivas wrote:

> IO Full Load:
> Kernel                  Time            CPU
> 2.5.38                  170.21          42%
> 2.5.38-gcc32            1405.25         8%

Ugh??  Something is _seriously_ messed up here.

The CPU utilization is only 8% but the time is nearly 10x worse.  You
sure the only difference was the compiler?  I could think gcc-3.2 makes
some poorer choices wrt code optimization, but nothing feasible can come
to mind that would produce such terrible results.

Also, I believe RedHat is compiling their kernel in 8.0 with gcc-3.2,
unless they reintroduced kgcc.  Surely that are not seeing these abysmal
numbers.

	Robert Love

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