How to push up to maximum frequency.

[dukla2000]

OK - think I have a fairly stable kernel running 2.0/1.5GHz.

My original sbc-bench results on 4.4.138 Ayufan kernel.

My latest sbc-bench results on 4.18-rc8 kernel I have hacked.

Which are pretty similar to those for a NanoPi M4. (Also RK3399, they have DDR3 mem AFAIK which seems a bit faster)

And for completeness (on the 4.18 kernel), my SM961:

Code:

iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2
[sudo] password for chris:
    Iozone: Performance Test of File I/O
            Version $Revision: 3.429 $
        Compiled for 64 bit mode.
        Build: linux
....
    Run began: Fri Sep 14 20:04:25 2018

...
    Command line used: iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2
...
                                                              random    random     bkwd    record    stride                                    
              kB  reclen    write  rewrite    read    reread    read     write     read   rewrite      read   fwrite frewrite    fread  freread
          102400       4    66040   113883   120757   122602    47917   112507                                                          
          102400      16   218566   333375   344785   354516   121497   330740                                                          
          102400     512   625190   598033   783060   952460   613227   624786                                                          
          102400    1024   632915   585959   874944   979528   751608   624748                                                          
          102400   16384   471660   624576  1313697  1468580  1451902   635818