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

Robin Holt
2005-11-04T21:37:46Z

On Fri, Nov 04, 2005 at 10:51:07AM -0800, Chen, Kenneth W wrote:
> Luck, Tony wrote on Wednesday, November 02, 2005 8:31 AM
> > Good to hear that (though I must remember to specify what I mean
> > by "small memory" when talking to SGI ... there are ia64 boxes
> > with only 1G :-)
> >
> > Ken: Any predictions on when a 4-level run might get to the
> > top of your queue for a run with an industry standard transaction
> > benchmark?
>
> It turns out that we have measurable performance regression with
> 4-level page table running industry database benchmark, the penalty
> is ~0.2% (I thought the number would be smaller than 0.2%, but ...).
> Our resolution with this workload is typically 0.05%.

Can you point me at this benchmark?

Thanks,
Robin