Comment on Boost local network performance (Increase network thoroughput) by enabling Jumbo Frames on GNU / Linux by Rodrigo.
Thank you for your article. I just have a few questions.
I ran ifconfig and got the following:
~$ ifconfig
enp0s25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.105 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::21b:d3ff:fede:14b0 prefixlen 64 scopeid 0x20<link>
ether 00:1b:d3:de:14:00 txqueuelen 1000 (Ethernet)
RX packets 16836848 bytes 20570410594 (19.1 GiB)
RX errors 46 dropped 0 overruns 0 frame 46
TX packets 9551682 bytes 1480264646 (1.3 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 20 memory 0xf4a00000-f4a20000lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 739 bytes 54099 (52.8 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 739 bytes 54099 (52.8 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
I run this command to check if my device can hold the 9000 MTU and as you said above, and as shown below it should be able to deal with it.
$ /sbin/ethtool enp0s25|grep -i 1000BaseT
Cannot get wake-on-lan settings: Operation not permitted
1000baseT/Full
1000baseT/Full
But when I try to change the MTU I get the following:
$ sudo ifconfig enp0s25 mtu 9000
SIOCSIFMTU: Invalid argument
Nonetheless I tried to change it to a higher value greater than 1500, and 4000 was the top value accepted, more than 4000 gives me and invalid argument error.
Why can't I change the value to 9000?
If I change the value to the local loop 'lo' to MTU 9000 is it going to make any improvements? I did change it, but I don't notice any change on speed with the samba server my router provides.
I also changed the MTU value of 'enp0s25' to 4000 which is the highest accepted, will it help somehow too?
Thanks in advance!
Mu current ifconfig looks like this:
~$ ifconfig
enp0s25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 4000
inet 192.168.0.105 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::21b:d3ff:fede:14b0 prefixlen 64 scopeid 0x20<link>
ether 00:1b:d3:de:14:b0 txqueuelen 1000 (Ethernet)
RX packets 20219625 bytes 25418439567 (23.6 GiB)
RX errors 46 dropped 0 overruns 0 frame 46
TX packets 10013520 bytes 1575719035 (1.4 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 20 memory 0xf4a00000-f4a20000lo: flags=73<UP,LOOPBACK,RUNNING> mtu 9000
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 1095 bytes 79847 (77.9 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1095 bytes 79847 (77.9 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
