FC4 and xen0 performance

[Alan Cox]

On Tue, Apr 05, 2005 at 11:53:33AM -0700, Jeffrey Buell wrote:
> results are pretty ugly compared to a 2.6.1 install. FC4 ranges from 1.5X to
> 20X slower, while xen0 is about 2X to 6X slower.  Is this expected? I'm
> looking for configuration differences now, but I'm wondering if anybody can

The fork ones are expected yes. The newest kernels have four level page tables
and while this allows for huge 64bit systems it has a cost and there is 
optimisation work left to do.

I've not checked the kernel config options but if you look at the src.rpm you
can see what debug is enabled