I've been investigating this issue for a while as my Samba speeds drop after 5seconds when I switched from an Intel setup to AMD. Same PCIE controllers but the CPU is a lower power Kabini 5150 AM1 processor and an Intel 1000 pro PCIE NIC is used. I've seen people use weaker processors with no issues though. I've tested hard drive write/read speeds using "dd" ~180mb/s write and ~100mb/s read, also used iperf to test the network ~930Mbps
Screen captures attached to show:
a. SMB to Windows transfer speed starts at 90Mb/s then drops to half after ~5Seconds, sometimes as low as 30Mb/s
b. CPU usage. Top shows ~45%, GUI shows ~25% oddly
I'm using OMV 2.0 with the updated backport kernel. Already using the SMB options recommended on this forum. Anything else worth trying?