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

Andrew Morton
2002-09-23T03:36:51Z

Con Kolivas wrote:
>
> I performed contest benchmarks on kernel 2.5.38 when the kernel is compiled with
> gcc3.2 to gcc2.95.3
>
> warning: The following benchmarks may be disturbing to some viewers:
>
> No Load:
> Kernel Time CPU
> 2.5.38 68.25 99%
> 2.5.38-gcc32 103.03 99%
>

Try gcc-2.91.66. It might break the 45 second mark.

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

The streaming write is stalling gcc's read for long enough for gcc's
working set to be evicted. And the working set cannot be reestablished
because the streaming write prevents it. Meltdown.

I have fixed this. Hang around.