Buffering Issues

I have massive stuttering because of network buffering on 4K ISO with “this” experimental build (don’t know the others since 3D ist a must). The RPi4 and the Zidoo X9S, all devices connectet via wire to the same switch to avoid WLAN problems are working well (the RPi4 have other “micro-stuttering” issues)
I have the bad feeling that the Vero4k+ have some problems with the network performance.
This may also be a problem on playing 3D ISO.

Do a iperf3 test and post the results here

looks like iperf works well but anyway, on 4K ISO i get a heavy buffering like the network where bad.

osmc@osmc:~$ iperf3 -c 192.168.111.108
Connecting to host 192.168.111.108, port 5201
[ 4] local 192.168.111.139 port 53776 connected to 192.168.111.108 port 5201
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.00 sec 90.1 MBytes 754 Mbits/sec 0 1.93 MBytes
[ 4] 1.00-2.01 sec 87.5 MBytes 730 Mbits/sec 0 2.85 MBytes
[ 4] 2.01-3.00 sec 87.3 MBytes 736 Mbits/sec 0 2.25 MBytes
[ 4] 3.00-4.00 sec 90.0 MBytes 755 Mbits/sec 0 2.44 MBytes
[ 4] 4.00-5.00 sec 88.3 MBytes 741 Mbits/sec 0 2.59 MBytes
[ 4] 5.00-6.01 sec 76.2 MBytes 631 Mbits/sec 0 2.64 MBytes
[ 4] 6.01-7.02 sec 73.8 MBytes 617 Mbits/sec 0 2.64 MBytes
[ 4] 7.02-8.01 sec 73.8 MBytes 625 Mbits/sec 0 1.29 MBytes
[ 4] 8.01-9.01 sec 72.5 MBytes 606 Mbits/sec 0 1.29 MBytes
[ 4] 9.01-10.01 sec 73.8 MBytes 617 Mbits/sec 0 1.29 MBytes


[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.01 sec 813 MBytes 681 Mbits/sec 0 sender
[ 4] 0.00-10.01 sec 813 MBytes 681 Mbits/sec receiver

iperf Done.

Looks ok, while surely values should be closer to 900Mbit in a clear environment.
Also did you try the otherway around?

How are you accessing this? Via Kodi inbuild access or FSTAB/autofs mounts?

How can i get the Vero4K+ to have a “clear enviroment”? If i put a Laptop on the same cable i’m writing and reading to the NAS with full speed (110 MB/s)

Not now.

I don’t know what the inbuild access is, i have defined a share via smb:.
Always via (Browse for new share -> add network location…) “Windows network SMB” don’t work for me.

The access to the server is on all my testing devices (RPi4 and Zidoo) always the same. If the Vero have special problems with SMB: i will try NFS: at home.

As long, as no other have the problem, i will dig out what’s wrong with my gear.

I think that will be crucial to test reverse first

Not sure what you mean, so have you mounted the Share via fstab/autofs?

Well NFS is always more performant but SMB is absolutely fine also on the Vero (I use it myself).

I mounted it via this dialog, add network location…
(the last one, not the Windows network one…)
https://www.dummies.com/wp-content/uploads/raspberry-pi-3e-browse-kodi-installation.jpg

Ok, thanks means you have added it via Kodi and not Kernel (fstab/autofs) mounts. The kernel mounts are more performant but with a gigabit connection the Kodi solution should still work. So my recommentdation remains to first test the reverse iperf3 so that we can see from there.

$ iperf3 -c 192.168.111.139
Connecting to host 192.168.111.139, port 5201
[ 5] local 192.168.111.108 port 52995 connected to 192.168.111.139 port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 108 MBytes 903 Mbits/sec 0 527 KBytes
[ 5] 1.00-2.00 sec 112 MBytes 941 Mbits/sec 0 600 KBytes
[ 5] 2.00-3.00 sec 113 MBytes 945 Mbits/sec 0 604 KBytes
[ 5] 3.00-4.00 sec 112 MBytes 940 Mbits/sec 0 604 KBytes
[ 5] 4.00-5.00 sec 112 MBytes 939 Mbits/sec 0 605 KBytes
[ 5] 5.00-6.00 sec 112 MBytes 943 Mbits/sec 0 609 KBytes
[ 5] 6.00-7.00 sec 112 MBytes 941 Mbits/sec 0 619 KBytes
[ 5] 7.00-8.00 sec 112 MBytes 942 Mbits/sec 0 631 KBytes
[ 5] 8.00-9.00 sec 112 MBytes 943 Mbits/sec 0 632 KBytes
[ 5] 9.00-10.00 sec 112 MBytes 938 Mbits/sec 0 632 KBytes


[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 1.09 GBytes 938 Mbits/sec 0 sender
[ 5] 0.00-10.00 sec 1.09 GBytes 937 Mbits/sec receiver

iperf Done.

That’s the values we expect. Might be flow control issue in the other direction.

Anyhow you might want to try kernel based mounts to see if you problem goes away with that

Probably worth starting a new thread for this as I don’t think its related to 3D build and it will muddy this thread and won’t necessarily reach the people that can help you.

1 Like

I agree, i’ve split this into a new thread.

Have now mounted as NFS: and it works now

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That’s great to hear. If you need any help path subbing your existing library feel free to ask. You can mark the topic as solved if everything is resolved.

If you wouldn’t mind could you state exactly what hardware your using for your file share.