FC4 and xen0 performance

Arjan van de Ven arjanv at redhat.com
Wed Apr 6 11:18:52 UTC 2005


On Wed, 2005-04-06 at 07:06 -0400, Alan Cox wrote:
> 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

early test kernels usually have all debugging stuff enabled that will
have a HUGE performance hit in such benchmarks. But that is why it is
test1 and not the final release...

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