[fritsch]

TCP should be the default for iperf - you're telling it to test UDP by using the -u option. You're also limiting the bandwidth to 100Mb (which you'll probably never see with UDP even without kernel issues).

I'd suggest using the following iperf options on the client:

text:


iperf -c 10.0.1.55 -t 60 -i 10

On the server, you only need:

text:


iperf -s

To access your kernel command line, you need to edit /flash/syslinux.cfg.

To make the /flash partition writeable, you first need to run mount -o remount,rw /flash.

You can use vi or nano to edit /flash/syslinux.cfg.

Make a backup of your current file with:

text:


cp /flash/syslinux.cfg /flash/syslinux.cfg.bak

The kernel command line is the line that begins with APPEND so if your current file looks like:

text:


DEFAULT linux

PROMPT 0



LABEL linux

KERNEL /KERNEL

APPEND boot=LABEL=System disk=LABEL=Storage quiet

then you need to change /flash/sylinux.cfg to be:

text:


DEFAULT linux

PROMPT 0



LABEL linux

KERNEL /KERNEL

APPEND boot=LABEL=System disk=LABEL=Storage quiet log_buf_len=16M

Obviously, if you get this wrong and corrupt the contents of this file you may have a non-booting system which you can recover using LibreELEC booted from a memory stick (you'll need to boot into live live mode, enable ssh, login with ssh and your internal HDD/SSD will be available via the /media path - restore syslinux.cfg from your syslinux.cfg.bak backup) then reboot from HDD/SSD.

Only make this change if you are confident about making the change.   

 I can make the/flash partition writable but nano gives me a new file.   

Is this the correct iperf output?:

Last login: Wed Nov  7 12:15:18 on ttys001
Johns-iMac-2:~ johnmerrill$ iperf -c 10.0.1.55 -t 60 -i 10
connect failed: Connection refused
Johns-iMac-2:~ johnmerrill$ ssh [email protected]
[email protected]'s password: 
##############################################
#                  LibreELEC                 #
#            https://libreelec.tv            #
##############################################

LibreELEC (official): 8.2.5 (Generic.x86_64)
LibreELEC:~ # iperf -c 10.0.1.55 -t 60 -i 10
Connecting to host 10.0.1.55, port 5201
[  4] local 10.0.1.55 port 57746 connected to 10.0.1.55 port 5201
[ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
[  4]   0.00-10.00  sec  31.1 GBytes  26.7 Gbits/sec    0   3.25 MBytes       
[  4]  10.00-20.00  sec  31.6 GBytes  27.1 Gbits/sec    0   3.25 MBytes       
[  4]  20.00-30.00  sec  31.5 GBytes  27.0 Gbits/sec    0   3.25 MBytes       
[  4]  30.00-40.00  sec  31.7 GBytes  27.2 Gbits/sec    0   3.25 MBytes       
[  4]  40.00-50.00  sec  31.1 GBytes  26.7 Gbits/sec    0   3.25 MBytes       
[  4]  50.00-60.00  sec  31.2 GBytes  26.8 Gbits/sec    0   3.25 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-60.00  sec   188 GBytes  26.9 Gbits/sec    0             sender
[  4]   0.00-60.00  sec   188 GBytes  26.9 Gbits/sec                  receiver

iperf Done.
LibreELEC:~ # 

 No. You host the server on the same computer you cannect to - that only tests Linux's local network which is fast :-)