Re: larger default page sizes...

[Christoph Lameter]

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.


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/