Well, whatever happened, it's now 7-10x faster after I explicitly disabled the firewall. I now get 9-10 MB/s over ssh going to the VM.
Here's the output from the test with the pve host:
pve iperf -s:
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-10.00 sec 0.00 Bytes 0.00...
Ok, so here is the output of iperf3. If it's relevant, the server is a VM running Ubuntu 16.04, and the machine I'm transferring to/from is a MacBook Pro running OS X 10.13.1
Here is the VM side with the VM running perf -c:
Connecting to host 192.168.1.37, port 5201
[ 4] local 192.168.1.134...
I have a question. I have an issue where I get normal speeds with the VMs transferring data TO another machine over ssh or smb, but when I'm transferring data from the machines to the VM, it is painfully slow (like 500 kb/s over LAN).
All firewalls are disabled and the write speeds on my disks...
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