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A20 poor sata performance


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Hi Everyone,

Is there anything additional required to enable better performance improvements  (kernel patch for TXTS and RXTS are set to 3 each see below link) on a Banana PI running Armbian V21 / V22 ?


I have updated the bootloader, and OS, and the performance is still abysmally poor.


Mechanical or SSD drive connected to on board SATA yields a whopping 2.7-10 MB/sec write speed using dd with a large block size, or with the iozone tool ~5 upto ~45 for larger block sizes.  

Still a very far cry from the ~120 after the kernel patch applied in ~2019 => https://forum.armbian.com/topic/10352-a20-sata-write-speed-improvement/


I would be happy with a consistent 10-20 MB/sec honestly... 


From what I've read it was included in the kernel after v5.2 by default? Armbian R22 is presently kernel 5.15 ... So is the manual kernel patch still required, or no? 



armbianmonitor -u output:


 bkwd    record    stride
              kB  reclen    write  rewrite    read    reread    read     write     read   rewrite      read   fwrite frewrite    fread  freread
          102400       4     1063     1074     4689     4367     4667       10  
          102400      16     2495     2529     7923     7962     7579       41  
          102400     512     5257     5278    10506    10484    10587     1297  
          102400    1024     5695     5259    10992    10997    10928     2236  
          102400   16384     5826     5441     9706    11679    11671     5689  

iozone test complete.




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