I've been trying to improve NFS performance at home, and in that process i ran iperf to get an overview of general network performance. I have two Jessie hosts connected to a dumb switch with Cat-5e. One host uses a Realtek RTL8169 PCI controller, and the other has an Intel 82583V on the motherboard.
iperf maxes out at about 725Mbps. At first I thought maybe the switch could be at fault, it's a really cheap one, so I connected both hosts to my router instead. Didn't change anything, and it had no significant impact on the load on the router. I can't try to run iperf on the router (OpenWRT), though, as it maxes out the CPU. Should I be getting more than 725Mbps in the real world? Could there be a driver issue, or some settings that aren't optimal? Unfortunately, these are the only two hosts I have with Gbit interfaces (except the router), so I can't test with another host. Could this be a MB/MiB issue? The iperf man page doesn't say which it reports. (Well, it says "Mbit/Mbyte", so I assume it does not mean MiB) Am I missing something obvious? I'm no networking guru, but I'm hoping to learn something from all of this, so all input is appreciated. Petter -- "I'm ionized" "Are you sure?" "I'm positive."
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