Network performance when copying files to Plex server inside ProxMox

[Appollonius]

Hello, I have an strange issue where I cannot come higher than 10MB/s when transferring a file to my Plex server within ProxMox.
I ran an speedtest-cli --simple command on the ProxMox server itself and the Plex VM and they were both pointing to 700+mbit... Hmm very strange indeed.
I am copying these files with WinSCP, but I also tried Filezilla and cyberduck but they all gave the same performance.

The Network card on the Plex VM is a Virtio paravirtualized card. Does someone know what the problem could be and where this could be?
The servers I use are the Dell R720 and the Dell R720XD they are both in the ProxMox cluster.

Thanks in advance!

 

[Appollonius]

It is weird though, the Plex host itself gets 4mbit upload, but the VM's inside get 600MBIT upload... I am on a 1 gigabit ethernet connection.

 

[Stoiko Ivanov]

There is a bug in speedtest-cli (reporting only 4Mbit on upload) - check with other utilities as well (iperf/iperf3)

see https://bugs.launchpad.net/ubuntu/+source/speedtest-cli/+bug/1828929

I hope this helps!

 

[Appollonius]

There is a bug in speedtest-cli (reporting only 4Mbit on upload) - check with other utilities as well (iperf/iperf3)

see https://bugs.launchpad.net/ubuntu/+source/speedtest-cli/+bug/1828929

I hope this helps!

Hi, yeah I have seen that bug. But if you install the newest version with python (pip install speedtest-cli) you get a newer stable version without this bug.

 

[Stoiko Ivanov]

Can you reproduce the slow uploads with anything else (i.e. not speedtest-cli)?

 

[Appollonius]

Can you reproduce the slow uploads with anything else (i.e. not speedtest-cli)?

I used iperf3 and the results were that it is not my home network, nor ProxMox it is somewhere in between. So I think the routing to my machines.

 

[Stoiko Ivanov]

If nothing else helps - you could try to record some traffic (on various interfaces where it passes) using `tcpdump` and check the pcap file with wireshark

i hope this helps!

 

[Appollonius]

If nothing else helps - you could try to record some traffic (on various interfaces where it passes) using `tcpdump` and check the pcap file with wireshark

i hope this helps!

Well apparently it has something todo between the connection of my ISP to the datacenter. As I have 80+ percent packet loss on an IP that is of my ISP.

 

[Stoiko Ivanov]

maybe check with `mtr` where the packetloss occurs - that would help your ISP/DC

 

[Appollonius]

maybe check with `mtr` where the packetloss occurs - that would help your ISP/DC

Yesterday I called my ISP with the MTR results and it results that somewhere on their line there is a 80%+ packet loss on a specific IP. But after that the packet loss is 0.0%. Someone also told me that it could be a Red Herring situation...