Re: larger default page sizes...

Christoph Lameter
2008-03-26T17:56:17Z

On Wed, 26 Mar 2008, Paul Mackerras wrote:

> So the improvement in the user time is almost all due to the reduced
> TLB misses (as one would expect). For the system time, using 64k
> pages in the VM reduces it by about 21%, and using 64k hardware pages
> reduces it by another 30%. So the reduction in kernel overhead is
> significant but not as large as the impact of reducing TLB misses.

One should emphasize that this test was a kernel compile which is not
a load that gains much from larger pages. 4k pages are mostly okay for
loads that use large amounts of small files.