Intel Sandy Bridge

Configuration

Intel i3-2120 (Sandy Bridge), 3.3 GHz, 32 nm. RAM: 16 GB (4 x 4GB), PC3-10700 (667 MHz) 9-9-9-24-2T.

2 MB pages mode (64-bit Windows)

  Size        Latency       Increase   Description

  32 K     4                           
  64 K     8               4           + 8 (L2)        
 128 K    10               2   
 256 K    11               1
 512 K    20               9           + 16 (L3)
   1 M    24               4
   2 M    26               2
   4 M    27 + 18 ns       1 + 18 ns   + 56 ns (RAM)
   8 M    28 + 38 ns       1 + 20 ns
  16 M    28 + 47 ns            9 ns   
  32 M    28 + 52 ns            5 ns
  64 M    28 + 54 ns            2 ns
 128 M    36 + 55 ns       8 +  1 ns   + 16 (TLB miss)
 256 M    40 + 56 ns       4 +  1 ns
 512 M    42 + 56 ns       2 
1024 M    43 + 56 ns       1 
2048 M    44 + 56 ns       1 
4096 M    44 + 56 ns       0 
8192 M    53 + 56 ns       9           + 18 (PDPTE cache miss)

4 KB pages mode (64-bit Windows)

  Size        Latency       Increase   Description

  32 K     4                           
  64 K     8               4   	       + 8 (L2)        
 128 K    10               2   
 256 K    11               1
 512 K    24              13           + 16 (L3) +7 (L1 TLB miss)
   1 M    30               6
   2 M    32               2
   4 M    39 +  18 ns      7 + 18 ns   + 56 ns (RAM) +10 (L1 TLB miss)
   8 M    44 +  38 ns      5 + 20 ns
  16 M    49 +  47 ns      5 +  9 ns   
  32 M    51 +  52 ns      2 +  5 ns
  64 M    60 +  54 ns      9 +  2 ns
 128 M    69 +  55 ns      9 +  1 ns   + 18 (PDE cache miss) + 16 (Page walk to L3)
 256 M    76 +  57 ns      7 +  2 ns
 512 M    79 +  70 ns      3 + 13 ns
1024 M    79 +  86 ns      0 + 16 ns   + 56 ns (Page walk to RAM)
2048 M    79 +  93 ns      0 +  7 ns
4096 M    79 + 103 ns      0 + 10 ns
8192 M    88 + 107 ns      9 +  4 ns   + 18 (PDPTE cache miss)

MISC