Multiple Sequential Reader vs Multiple Random Reader
===============================================
Vanilla CFQ
-----------------------------------
[Multiple Sequential Reader]                  [Multiple Random Reader]  
nr  Max-bandw Min-bandw Agg-bandw Max-latency nr  Agg-bandw Max-latency 
16  959KB/s   284KB/s   13883KB/s 1740K usec  1   10KB/s    3226 msec   
16  949KB/s   267KB/s   12805KB/s 1750K usec  2   30KB/s    3461 msec   
16  840KB/s   201KB/s   11529KB/s 2018K usec  4   59KB/s    3937 msec   
16  743KB/s   188KB/s   9310KB/s  2557K usec  8   102KB/s   3336 msec   
16  857KB/s   156KB/s   9953KB/s  2539K usec  16  491KB/s   2951K usec  

IO scheduler controller + CFQ
-----------------------------------
[Multiple Sequential Reader]                  [Multiple Random Reader]  
nr  Max-bandw Min-bandw Agg-bandw Max-latency nr  Agg-bandw Max-latency 
16  503KB/s   114KB/s   6390KB/s  3352K usec  1   222KB/s   232K usec   
16  515KB/s   108KB/s   6342KB/s  3440K usec  2   214KB/s   554K usec   
16  496KB/s   150KB/s   6199KB/s  3420K usec  4   180KB/s   1380K usec  
16  561KB/s   79KB/s    6500KB/s  3395K usec  8   154KB/s   3165 msec   
16  493KB/s   100KB/s   6364KB/s  3441K usec  16  145KB/s   5753 msec   

dm-ioaband + CFQ
-----------------------------------
[Multiple Sequential Reader]                  [Multiple Random Reader]  
nr  Max-bandw Min-bandw Agg-bandw Max-latency nr  Agg-bandw Max-latency 
16  939KB/s   373KB/s   10818KB/s 1373K usec  1   33KB/s    1242K usec  
16  1046KB/s  152KB/s   7909KB/s  1385K usec  2   88KB/s    1901K usec  
16  374KB/s   56KB/s    2484KB/s  2053K usec  4   293KB/s   2421K usec  
16  137KB/s   29KB/s    1591KB/s  3042K usec  8   904KB/s   3215K usec  
16  195KB/s   51KB/s    1863KB/s  2247K usec  16  1187KB/s  3191K usec