I tried using Jumbo Frames, and I think there may have been
a slight increase in transfer speed, but by the time I was
hitting around 80+ MBytes/sec I had (1) reached the maximum
read/write speed of the single Western Digital WD5000AAKS
disk inside the Mac Pro, and (2) both processor cores of the
AMD BE-2350 processor seemed to be maxed out.
I was a bit surprised at the maxing out of the processor on
the ZFS fileserver but it's not at the top of the
performance rankings and I don't know what was eating all
the processor power. Could have been ZFS code or it could
have been a network or SATA driver that was taking most of
the clock cycles. No doubt someone here could give the
instructions to see what was taking all the clock cycles. If
they do, I'll re-run a transfer and we'll see who is eating
all the cycles.
The ZFS fileserver has 3 WD7500AAKS drives, 4GB DDR2 800 ECC
RAM, dual gigabit ethernet NICs, and the Mac Pro has a
single WD5000AAKS drive, 5GB RAM, dual gigabit ethernet
NICs. I trunked the 2 GbE NICs at each end via a LinkSys
SRW2008 managed switch.
As I said previously though, I think the reason you're not
seeing any more than 40 MBytes/sec transfers is because your
iMac is not trunked, as it has a single gigabit ethernet
NIC. To get any advantage with trunking, from all that I've
heard, you need to have trunking on each machine where you
want to get a speed increase.
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