RE: [RFC] 4-level page table directories.

Chen, Kenneth W
2005-11-03T19:59:00Z

Robin Holt wrote on Thursday, November 03, 2005 8:37 AM
> On Wed, Nov 02, 2005 at 05:53:10PM -0800, Chen, Kenneth W wrote:
> > I just did a quick measurement with I/O submission path. get_user_pages
> > is my biggest concern that extra level means more code and cache foot
> > print for each I/O submission. It cost about 1.5% more in I/O path
> > length on a micro-benchmark (from block layer and Up). This could be
> > all buried as noise in a larger scheme for industry database benchmark.
>
> Can you point me at the benchmark?

Here, kernel null blk driver:
http://marc.theaimsgroup.com/?l=linux-kernel&m\x111033439400836&w=2

And here: user space micro-benchmark:
http://marc.theaimsgroup.com/?l=linux-kernel&m\x111033404219628&w=2

- Ken