Slow transfer speed of AoE

TuxOholic <tuxoholic@xxxxxxxxxx> · Thu, 8 Oct 2015 20:59:12 +0200



    Hi experts
    I use Debian
      Jessie on two Banana-PI with kernel 3.19 and have installed
      aoe.ko,
      vblade and aoetools. Both systems are connected by Gbit LAN via a
      Gbit switch. The MTU is set at 1500 and can't be changed because
      the
      Ethernet driver does not support it for that hardware.
    Without
AoE,
        when I read/write data
        of 1GB size on the other system via nfs, I get speeds of 55 / 35
        MB/s
        respectively. Writing is probably so much slower due to a bug in
        the
        Allwinner A20 silicone or somewhere in software.
    However,
if
        I map the drive of one system to the other via
        AoE and do
        reading/writing
        to this mapped raw device (/dev/etherd/e0.1), the speeds get
        very low,
        typically 21/7 MB/s respectively. Only when rather small amount
        of
        data like 150 MB files are transferred, the speed is higher like
        35/25 MB/s.
    I wonder why
      AoE is so slow and hope you can tell me what must be changed to
      get
      better transfer rates.
    Many thanks!

    
    TuxOholic

      
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