Alan Cox wrote:
On Sun, Jun 28, 2009 at 7:14 PM, Nathanael Hoyle <nho...@hoyletech.com>wrote:
Wojciech Puchar wrote:
i enabled
vm.pmap.pg_ps_enabled: 1
could you please explain what exactly this values means?
because i don't understand why promotions-demotions!=mappings
vm.pmap.pde.promotions: 2703
vm.pmap.pde.p_failures: 6290
vm.pmap.pde.mappings: 610
vm.pmap.pde.demotions: 289
other question - tried enabling it on my i386 laptop (256 megs ram),
always mappings==0, while promitions>demotions>0.
certainly there are apps that could be put on big pages, gimp editing 40MB
bitmap for example
Just to be clear, since you say i386 (I presume you mean architecture), I
believe the Physical Address Extensions which allowed 2MB Page Size bit to
be set was introduced with Pentium Pro. Processors prior to this were
limited to standard 4KB pages.
No. Many of those processors supported 4MB pages.
Regards,
Alan
_______________________________________________
Having been corrected by both you and Joerg (thank you!), I went back to
re-verify my understanding. It appears that while I was slightly mixing
PAE in with PSE, PSE support for 4MB pages was introduced 'silently'
with the Pentium, and documented first with the Pentium Pro. I haven't
found anything that points to earlier inclusion. Certainly the 80386
processor specifically, I am fairly confident would be limited to the
4KB pages.
Agreed? Or are you aware of earlier usage than the Pentium for 4MB pages?
Thanks,
-Nathanael
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