Subject: Re: largepage success
To: Bill Sommerfeld <>
From: Manuel Bouyer <>
List: port-i386
Date: 09/09/2000 00:35:46
On Fri, Sep 08, 2000 at 04:26:01PM -0400, Bill Sommerfeld wrote:
> What cpu feature flags are enabled on the K6/II? (these should now be
> printed as part of the boot messages).   
> My K6 reports PSE, but not PGE (pte global extension), which means it
> will be doing a full TLB flush on every context switch, which will
> likely significantly reduce how much you win from mapping the kernel
> with a large page.

uh, I got the same close results (i.e no perf improvements) on my celeron 500
at home, which has this:
cpu0: features 183f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR>
cpu0: features 183f9ff<PGE,MCA,CMOV,FGPAT,PSE36,MMX,FXSR>

I guess all what's needed is here ...

Either something didn't get enabled (althout I checked that LARGEPAGE is
defined), or this isn't as good as it looked :)

Manuel Bouyer <>