Re: [BENCHMARK] gcc3.2 v 2.95.3 (contest and linux-2.5.38)

Con Kolivas
2002-09-23T03:11:50Z

Quoting Robert Love <rml@tech9.net>:

> 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.

Agreed!

> 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.

Absolutely certain. I'm shaking from the results still... hard to type...

> 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.

contest is a new benchmark. Noone has ever done anything like this before so it
wouldn't have shown up in ordinary benchmarks. Mandrake has done the same with
LM9.0 I believe

Con