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 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
------------------------------------------------------------------------------
_______________________________________________
Aoetools-discuss mailing list
Aoetools-discuss@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/aoetools-discuss
|
------------------------------------------------------------------------------
_______________________________________________
Aoetools-discuss mailing list
Aoetools-discuss@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/aoetools-discuss
