FC4 test (x86_64) poor performance

[Dave Jones]

On Mon, May 30, 2005 at 12:03:44AM -0400, Vlad wrote:

 > >  > FC4 x86_64, kernel is 2.6.11-1.1363_FC4 - the RPS is 730.
 > >  > FC3 x86_64, latests kernel - same results.
 > >  > FC3 i386, latests kernel - 570 RPS.
 > >  > FreeBSD 5.4-RELEASE (x86_64, stock kernel) - 670 RPS
 > > 
 > > I'd suspect the reason FC3 sucks right now on this benchmark is that
 > > 2.6.11 contained the 4-level page table support for AMD64, though
 > > it wasn't optimised until 2.6.12rc.
 > > 
 > > At least its the only thing that comes to mind that could explain
 > > such a huge delta between the two. Good to know things are back
 > > to normal however.
 > > 
 > wait, you mean the i386 version of FC3? case FC3 x86_64 shows same
 > numbers as FC4 x86_64 for me....

Oh, in that case, I have no explanation, as the 4-level pagetables
should have only affected x86-64.

		Dave