Benchmarks of 5.4 and 6.0 on a 6-CPU host (HP Netserver LT 6000r)

[Kris Kennaway]

On Thu, Jan 12, 2006 at 11:27:34AM +0100, David Landgren wrote:
> List,
> 
> A while back, I mentioned that I was going to bring a six-processor box 
> (an HP Netserver LT 6000r) from 5.x to 6.0-STABLE, and someone asked for 
> some before and after benchmarks. With the recent spate of advisories, I 
> figured it was time to recompile the world, which gave me the chance to 
> perform the other side of the benchmark, to see how 6.0 performs.
> 
> The benchmark was of course to buildworld and buildkernel.

Unfortunately this isn't valid because you're not compiling the same
code using the same tools.  A valid benchmark would 

* Use the same compiler (e.g. 5.4 gcc toolchain, on 5.4 and 6.0
kernels)

* Compile the same code, e.g. a 5.4 world (you can't use a 6.0 world
because there is extra bootstrapping compilation enabled when building
6.0 on a 5.4 kernel).

The easiest way to do this is to extract a 5.4 world + source tree
into a subdirectory, boot your chosen kernel, and chroot to the
subdirectory, then time the builds in both cases.

Kris
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