[lkml]   [2002]   [Mar]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [Lse-tech] Re: 10.31 second kernel compile
Date writes:

> is there a 64 bit machine with hardware search of pagetables? Even ibm
> only has a hardware search of hash tables - which we agree are simply
> a means of making your hardware TLB larger and slower.

x86-64 aka AMD Hammer does hardware (or more likely microcode) search of
page tables.
It has a 4 level page table with 4K pages. Generic Linux MM code only sees
the first slot in 4th level page limit user space to 512GB with 3 levels.
Direct mappings and kernel mappings are handled specially by architecture
specific code outside that first slot.

The CPU itself has I/D TLBs split into L1 and L2.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:24    [W:0.224 / U:11.092 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site