Re: kernbench-16 on 2.5.59 vs 2.5.59-mm6

[William Lee Irwin III]

On Mon, Jan 27, 2003 at 09:36:52AM -0800, Martin J. Bligh wrote:
> 132 clear_page_tables
> 131 pgd_ctor
> -413 pgd_alloc

The pagetable preconstruction cache hit is spread across
clear_page_tables() and pgd_ctor() with the pgd_ctor patches.
This is the equivalent of the explicit zeroing in pgd_alloc().

Your result appears to imply the overhead has been reduced by 36%,
which is useful evidence for the PAE case. Before this the pgd_alloc()
overhead had only been observed on non-PAE systems.

Now, YTF hadn't I seen this before if all it took to bring it out was
a kernel compile? Perhaps diffprof (I prefer the multiplicative flavor
but nm that) of some flavor was lacking.

-- wli