how to set FwgThread threads counts?

c1e7607f-1d58-4704-bf68-c1fc5e0a81fa

    It seams that the FwgThread is responsible for handling request to underlying filesystem. changing threads parameters does't affect the threads count of FwgThread, always been 8, so how to change  it? I want to see how the thread count affect my filesystem performance.

     

    81578 root      20   0   11.6g 808448  17280 D  1.0  0.1   0:03.37 FwgThread OpFor

    81577 root      20   0   11.6g 808448  17280 D  0.7  0.1   0:03.36 FwgThread OpFor

    81579 root      20   0   11.6g 808448  17280 D  0.7  0.1   0:03.36 FwgThread OpFor

    81580 root      20   0   11.6g 808448  17280 D  0.7  0.1   0:03.38 FwgThread OpFor

    81581 root      20   0   11.6g 808448  17280 D  0.7  0.1   0:03.36 FwgThread OpFor

    81582 root      20   0   11.6g 808448  17280 D  0.7  0.1   0:03.37 FwgThread OpFor

    81583 root      20   0   11.6g 808448  17280 D  0.7  0.1   0:03.37 FwgThread OpFor

    81584 root      20   0   11.6g 808448  17280 D  0.7  0.1   0:03.36 FwgThread OpFor