Firstly, I don't know.
Secondly, one thing to always check are caching effects.
So you cannot be sure that you're getting 55 or 35 MBps unless you know
that you're not just measuring reads and writes from RAM. The kernel,
if left alone, will aggressively attempt to make sure that's what happens.
Some good tools are the drop_caches file under /proc/sys/vm (with
documentation in the kernel source, unfortunately), the boot
parameter("mem=") that allows you to use less than the installed amount
of RAM, and workloads for testing that include more data than can fit
into RAM.
On 10/08/2015 02:59 PM, TuxOholic wrote:
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 dataof 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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