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Ubuntu 18.04 vs 17.10, re: ChuckPA's speed tests

apiontekapiontek Posts: 44Members, Plex Pass Plex Pass
edited May 14 in Linux

As per https://forums.plex.tv/discussion/319235/ubuntu-18-04-lts-initial-issues-warning#latest

Apparently plexmediaserver on Ubuntu 18.04 experiences slower transmit speeds vs plexmediaserver on Ubuntu 16.04.

However, my plexmediaserver is currently running on Ubuntu 17.10. I'm wondering if the same problem exists on 17.10, and I just didn't realize it? Does anybody know?

Does anybody know how those iperf3 tests were done? I'd be interested in replicating them on my hardware...

Best Answers

Answers

  • ChuckPAChuckPA Posts: 22,321Members, Plex Pass, Plex Ninja, Plex Team Member Plex Team Member
    edited May 15

    On the serving machine: iperf3 -s -p port_number -B adapter-ip-to-bind-to-if-multiple-adapters
    On the client (test) machine: iperf3 -c ip.addr.of.server -p port_number -t number_of_samples

    The -R option is added to the second pass to test the reverse direction

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  • apiontekapiontek Posts: 44Members, Plex Pass Plex Pass

    OK. So I did those tests, with and without the -R option, between two machines, one running Ubuntu 17.10, and one running Ubuntu 18.04, and I got bandwidth results hovering around 935 Mbits/sec both ways, regardless of which was the serving machine for the iperf3 test.

    As I understand it, iperf3 is a raw bandwidth test, unrelated to plex. One would also use it with one's router and everything turned off, to test ISP performance, for example.

    So the results you got for 16.04 vs 18.04 would seem to indicate to me, based on my own results, that when you did the test on 18.04, some driver or something else was interfering with the network speed.

    At least for me, on my hardware, with these tests, it would suggest that if I upgrade the 17.10 plex server to 18.04, I should expect to continue to see bandwidth results in the 935Mbits/sec range.

  • ChuckPAChuckPA Posts: 22,321Members, Plex Pass, Plex Ninja, Plex Team Member Plex Team Member

    If you don't use the -R option, you're missing half the results.

    The results posted are those obtained by another Ninja and myself. We did not make the post until having considered all avenues. I will also add, he's an extremely competent engineer and knows networking far better than I ever could.

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  • apiontekapiontek Posts: 44Members, Plex Pass Plex Pass
    edited May 16

    I used -R. I trust other people's knowledge and experience to a degree, and also I have to trust my results (which is with a lot of other normal operation going on):

    Ubuntu 18.04 machine as iperf3 server

    ip 172.22.1.20

    adam@troughton:~$ lsb_release -a
    No LSB modules are available.
    Distributor ID: Ubuntu
    Description:    Ubuntu 18.04 LTS
    Release:    18.04
    Codename:   bionic
    adam@troughton:~$ uname -a
    Linux troughton 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
    adam@troughton:~$ iperf3 -s -p 15432 -B 172.22.1.20
    -----------------------------------------------------------
    Server listening on 15432
    -----------------------------------------------------------
    Accepted connection from 172.22.1.10, port 45828
    [  5] local 172.22.1.20 port 15432 connected to 172.22.1.10 port 45830
    [ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
    [  5]   0.00-1.00   sec   109 MBytes   918 Mbits/sec    0    526 KBytes       
    [  5]   1.00-2.00   sec   111 MBytes   933 Mbits/sec    0    526 KBytes       
    [  5]   2.00-3.00   sec   111 MBytes   933 Mbits/sec    0    551 KBytes       
    [  5]   3.00-4.00   sec   111 MBytes   930 Mbits/sec    0    551 KBytes       
    [  5]   4.00-5.00   sec   112 MBytes   936 Mbits/sec    0    580 KBytes       
    [  5]   5.00-6.00   sec   111 MBytes   933 Mbits/sec    0    580 KBytes       
    [  5]   6.00-7.00   sec   111 MBytes   931 Mbits/sec    0    580 KBytes       
    [  5]   7.00-8.00   sec   112 MBytes   942 Mbits/sec    0    580 KBytes       
    [  5]   8.00-9.00   sec   111 MBytes   930 Mbits/sec    0    580 KBytes       
    [  5]   9.00-10.00  sec   111 MBytes   934 Mbits/sec    0    580 KBytes       
    [  5]  10.00-10.04  sec  4.72 MBytes   903 Mbits/sec    0    580 KBytes       
    - - - - - - - - - - - - - - - - - - - - - - - - -
    [ ID] Interval           Transfer     Bandwidth       Retr
    [  5]   0.00-10.04  sec  1.09 GBytes   932 Mbits/sec    0             sender
    [  5]   0.00-10.04  sec  0.00 Bytes  0.00 bits/sec                  receiver
    -----------------------------------------------------------
    

    Ubuntu 17.10 machine as iperf3 client

    adam@hartnell:~$ iperf3 -c 172.22.1.20 -p 15432 -t 10 -R
    Connecting to host 172.22.1.20, port 15432
    Reverse mode, remote host 172.22.1.20 is sending
    [  4] local 172.22.1.10 port 45830 connected to 172.22.1.20 port 15432
    [ ID] Interval           Transfer     Bandwidth
    [  4]   0.00-1.00   sec   111 MBytes   934 Mbits/sec                  
    [  4]   1.00-2.00   sec   111 MBytes   934 Mbits/sec                  
    [  4]   2.00-3.00   sec   111 MBytes   934 Mbits/sec                  
    [  4]   3.00-4.00   sec   111 MBytes   928 Mbits/sec                  
    [  4]   4.00-5.00   sec   111 MBytes   935 Mbits/sec                  
    [  4]   5.00-6.00   sec   111 MBytes   934 Mbits/sec                  
    [  4]   6.00-7.00   sec   111 MBytes   934 Mbits/sec                  
    [  4]   7.00-8.00   sec   111 MBytes   934 Mbits/sec                  
    [  4]   8.00-9.00   sec   111 MBytes   934 Mbits/sec                  
    [  4]   9.00-10.00  sec   111 MBytes   934 Mbits/sec                  
    - - - - - - - - - - - - - - - - - - - - - - - - -
    [ ID] Interval           Transfer     Bandwidth       Retr
    [  4]   0.00-10.00  sec  1.09 GBytes   936 Mbits/sec    0             sender
    [  4]   0.00-10.00  sec  1.09 GBytes   934 Mbits/sec                  receiver
    
    iperf Done.
    

    Ubuntu 17.10 machine as iperf3 server

    ip 172.22.1.10

    adam@hartnell:~$ lsb_release -a
    No LSB modules are available.
    Distributor ID: Ubuntu
    Description:    Ubuntu 17.10
    Release:    17.10
    Codename:   artful
    adam@hartnell:~$ uname -a
    Linux hartnell 4.13.0-41-generic #46-Ubuntu SMP Wed May 2 13:38:30 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
    adam@hartnell:~$ iperf3 -s -p 15432 -B 172.22.1.10
    -----------------------------------------------------------
    Server listening on 15432
    -----------------------------------------------------------
    Accepted connection from 172.22.1.20, port 34554
    [  5] local 172.22.1.10 port 15432 connected to 172.22.1.20 port 34556
    [ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
    [  5]   0.00-1.00   sec   108 MBytes   905 Mbits/sec    0    389 KBytes       
    [  5]   1.00-2.00   sec   110 MBytes   922 Mbits/sec    0    389 KBytes       
    [  5]   2.00-3.00   sec   106 MBytes   888 Mbits/sec    0    389 KBytes       
    [  5]   3.00-4.00   sec   107 MBytes   901 Mbits/sec    0    389 KBytes       
    [  5]   4.00-5.00   sec   100 MBytes   839 Mbits/sec    0    410 KBytes       
    [  5]   5.00-6.00   sec   109 MBytes   912 Mbits/sec    0    437 KBytes       
    [  5]   6.00-7.00   sec   108 MBytes   905 Mbits/sec   27    352 KBytes       
    [  5]   7.00-8.00   sec   106 MBytes   890 Mbits/sec    0    382 KBytes       
    [  5]   8.00-9.00   sec   109 MBytes   911 Mbits/sec    0    433 KBytes       
    [  5]   9.00-10.00  sec   110 MBytes   920 Mbits/sec    0    433 KBytes       
    [  5]  10.00-10.04  sec  3.54 MBytes   808 Mbits/sec    0    433 KBytes       
    - - - - - - - - - - - - - - - - - - - - - - - - -
    [ ID] Interval           Transfer     Bandwidth       Retr
    [  5]   0.00-10.04  sec  1.05 GBytes   899 Mbits/sec   27             sender
    [  5]   0.00-10.04  sec  0.00 Bytes  0.00 bits/sec                  receiver
    -----------------------------------------------------------
    

    Ubuntu 18.04 machine as iperf3 client

    adam@troughton:~$ iperf3 -c 172.22.1.10 -p 15432 -t 10 -R
    Connecting to host 172.22.1.10, port 15432
    Reverse mode, remote host 172.22.1.10 is sending
    [  4] local 172.22.1.20 port 34556 connected to 172.22.1.10 port 15432
    [ ID] Interval           Transfer     Bandwidth
    [  4]   0.00-1.00   sec   110 MBytes   923 Mbits/sec                  
    [  4]   1.00-2.00   sec   110 MBytes   922 Mbits/sec                  
    [  4]   2.00-3.00   sec   106 MBytes   891 Mbits/sec                  
    [  4]   3.00-4.00   sec   107 MBytes   896 Mbits/sec                  
    [  4]   4.00-5.00   sec  99.8 MBytes   837 Mbits/sec                  
    [  4]   5.00-6.00   sec   109 MBytes   913 Mbits/sec                  
    [  4]   6.00-7.00   sec   108 MBytes   905 Mbits/sec                  
    [  4]   7.00-8.00   sec   106 MBytes   892 Mbits/sec                  
    [  4]   8.00-9.00   sec   109 MBytes   914 Mbits/sec                  
    [  4]   9.00-10.00  sec   109 MBytes   914 Mbits/sec                  
    - - - - - - - - - - - - - - - - - - - - - - - - -
    [ ID] Interval           Transfer     Bandwidth       Retr
    [  4]   0.00-10.00  sec  1.05 GBytes   902 Mbits/sec   27             sender
    [  4]   0.00-10.00  sec  1.05 GBytes   901 Mbits/sec                  receiver
    
    iperf Done.
    

    shrug ... maybe Ubuntu updated something since you did your tests.

  • ChuckPAChuckPA Posts: 22,321Members, Plex Pass, Plex Ninja, Plex Team Member Plex Team Member

    Very possible. I've asked for better eyes than mine to jump in. We will get to the bottom of it. It might be something as stupid as hardware and a faulty driver somewhere <shrug> but he'll know better.

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  • AchillesAchilles Posts: 2,261Members, Plex Pass, Plex Ninja Plex Ninja

    @piontek What Ethernet controller are your running?

  • CurunCurun Posts: 119Members, Plex Pass Plex Pass
    edited May 16

    I don't see anything troubling...?

    Win10 has a Gigabyte H270m mainboard with KabyLake and onboard Intel NIC.
    18.04LTS has a Gigabyte H370m mainboard with CoffeeLake and onboard Intel NIC.

    Server: 18.04LTS PlexServer

    Client: Win10 using Ubuntu for Windows 18.04 bash linux binary as client:

    iperf3 -c 192.168.1.155 -t 10
    Connecting to host 192.168.1.155, port 5201
    [  4] local 192.168.1.136 port 64590 connected to 192.168.1.155 port 5201
    iperf3: getsockopt - Protocol not available
    [ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
    [  4]   0.00-1.00   sec   110 MBytes   924 Mbits/sec  1296506930   0.00 Bytes
    iperf3: getsockopt - Protocol not available
    [  4]   1.00-2.00   sec   111 MBytes   928 Mbits/sec    0   0.00 Bytes
    iperf3: getsockopt - Protocol not available
    [  4]   2.00-3.00   sec   112 MBytes   944 Mbits/sec    0   0.00 Bytes
    iperf3: getsockopt - Protocol not available
    [  4]   3.00-4.00   sec   110 MBytes   919 Mbits/sec    0   0.00 Bytes
    iperf3: getsockopt - Protocol not available
    [  4]   4.00-5.00   sec   111 MBytes   930 Mbits/sec    0   0.00 Bytes
    iperf3: getsockopt - Protocol not available
    [  4]   5.00-6.00   sec   113 MBytes   944 Mbits/sec    0   0.00 Bytes
    iperf3: getsockopt - Protocol not available
    [  4]   6.00-7.00   sec   109 MBytes   914 Mbits/sec    0   0.00 Bytes
    iperf3: getsockopt - Protocol not available
    [  4]   7.00-8.00   sec   111 MBytes   928 Mbits/sec    0   0.00 Bytes
    iperf3: getsockopt - Protocol not available
    [  4]   8.00-9.00   sec   112 MBytes   941 Mbits/sec    0   0.00 Bytes
    iperf3: getsockopt - Protocol not available
    [  4]   9.00-10.00  sec   110 MBytes   927 Mbits/sec  2998460366   0.00 Bytes
    - - - - - - - - - - - - - - - - - - - - - - - - -
    [ ID] Interval           Transfer     Bandwidth       Retr
    [  4]   0.00-10.00  sec  1.08 GBytes   930 Mbits/sec    0             sender
    [  4]   0.00-10.00  sec  1.08 GBytes   930 Mbits/sec                  receiver
    
    
    iperf3 -c 192.168.1.155 -t 10 -R
    Connecting to host 192.168.1.155, port 5201
    Reverse mode, remote host 192.168.1.155 is sending
    [  4] local 192.168.1.136 port 64587 connected to 192.168.1.155 port 5201
    iperf3: getsockopt - Protocol not available
    [ ID] Interval           Transfer     Bandwidth
    [  4]   0.00-1.00   sec   112 MBytes   943 Mbits/sec
    iperf3: getsockopt - Protocol not available
    [  4]   1.00-2.00   sec   112 MBytes   940 Mbits/sec
    iperf3: getsockopt - Protocol not available
    [  4]   2.00-3.00   sec   112 MBytes   940 Mbits/sec
    iperf3: getsockopt - Protocol not available
    [  4]   3.00-4.00   sec   112 MBytes   940 Mbits/sec
    iperf3: getsockopt - Protocol not available
    [  4]   4.00-5.00   sec   112 MBytes   941 Mbits/sec
    iperf3: getsockopt - Protocol not available
    [  4]   5.00-6.00   sec   112 MBytes   940 Mbits/sec
    iperf3: getsockopt - Protocol not available
    [  4]   6.00-7.00   sec   112 MBytes   941 Mbits/sec
    iperf3: getsockopt - Protocol not available
    [  4]   7.00-8.00   sec   112 MBytes   941 Mbits/sec
    iperf3: getsockopt - Protocol not available
    [  4]   8.00-9.00   sec   112 MBytes   941 Mbits/sec
    iperf3: getsockopt - Protocol not available
    [  4]   9.00-10.00  sec   112 MBytes   939 Mbits/sec
    - - - - - - - - - - - - - - - - - - - - - - - - -
    [ ID] Interval           Transfer     Bandwidth       Retr
    [  4]   0.00-10.00  sec  1.10 GBytes   942 Mbits/sec    0             sender
    [  4]   0.00-10.00  sec  1.10 GBytes   941 Mbits/sec                  receiver
    

    Server: 18.04LTS PlexServer

    Client: Windows10 cmd prompt / Win10 binary as client:

    iperf3 -c 192.168.1.155 -t 10
    Connecting to host 192.168.1.155, port 5201
    [  4] local 192.168.1.136 port 64632 connected to 192.168.1.155 port 5201
    [ ID] Interval           Transfer     Bandwidth
    [  4]   0.00-1.00   sec   112 MBytes   939 Mbits/sec
    [  4]   1.00-2.00   sec   111 MBytes   931 Mbits/sec
    [  4]   2.00-3.00   sec   113 MBytes   944 Mbits/sec
    [  4]   3.00-4.00   sec   112 MBytes   944 Mbits/sec
    [  4]   4.00-5.00   sec   112 MBytes   944 Mbits/sec
    [  4]   5.00-6.00   sec   112 MBytes   943 Mbits/sec
    [  4]   6.00-7.00   sec   112 MBytes   942 Mbits/sec
    [  4]   7.00-8.00   sec   112 MBytes   937 Mbits/sec
    [  4]   8.00-9.00   sec   112 MBytes   943 Mbits/sec
    [  4]   9.00-10.00  sec   112 MBytes   938 Mbits/sec
    - - - - - - - - - - - - - - - - - - - - - - - - -
    [ ID] Interval           Transfer     Bandwidth
    [  4]   0.00-10.00  sec  1.09 GBytes   940 Mbits/sec                  sender
    [  4]   0.00-10.00  sec  1.09 GBytes   940 Mbits/sec                  receiver
    
    iperf3 -c 192.168.1.155 -t 10 -R
    Connecting to host 192.168.1.155, port 5201
    Reverse mode, remote host 192.168.1.155 is sending
    [  4] local 192.168.1.136 port 64644 connected to 192.168.1.155 port 5201
    [ ID] Interval           Transfer     Bandwidth
    [  4]   0.00-1.00   sec   112 MBytes   943 Mbits/sec
    [  4]   1.00-2.00   sec   112 MBytes   941 Mbits/sec
    [  4]   2.00-3.00   sec   112 MBytes   940 Mbits/sec
    [  4]   3.00-4.00   sec   112 MBytes   941 Mbits/sec
    [  4]   4.00-5.00   sec   112 MBytes   940 Mbits/sec
    [  4]   5.00-6.00   sec   112 MBytes   941 Mbits/sec
    [  4]   6.00-7.00   sec   112 MBytes   940 Mbits/sec
    [  4]   7.00-8.00   sec   112 MBytes   942 Mbits/sec
    [  4]   8.00-9.00   sec   112 MBytes   942 Mbits/sec
    [  4]   9.00-10.00  sec   112 MBytes   937 Mbits/sec
    - - - - - - - - - - - - - - - - - - - - - - - - -
    [ ID] Interval           Transfer     Bandwidth       Retr
    [  4]   0.00-10.00  sec  1.10 GBytes   942 Mbits/sec    0             sender
    [  4]   0.00-10.00  sec  1.10 GBytes   941 Mbits/sec                  receiver
    
  • apiontekapiontek Posts: 44Members, Plex Pass Plex Pass
    edited May 16

    @Curun I'm no expert on Windows' linux abilities, but I think if the issue is a kernel driver in Ubuntu 18.04, you wouldn't see the problem on Windows as it's really using the Windows kernel & drivers behind the scenes?

    @Achilles thanks, that's helpful. I'm doing link bonding & bridging on both machines, but the underlying network adapters are:

    Ubuntu 18.04 machine

    00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I217-V (rev 05)
        Subsystem: ASUSTeK Computer Inc. Ethernet Connection I217-V
        Kernel driver in use: e1000e
        Kernel modules: e1000e
    02:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection
        Subsystem: Intel Corporation Gigabit CT Desktop Adapter
        Kernel driver in use: e1000e
        Kernel modules: e1000e
    

    Ubuntu 17.10 machine

    00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I217-LM (rev 05)
        Subsystem: Tyan Computer Ethernet Connection I217-LM
        Kernel driver in use: e1000e
        Kernel modules: e1000e
    02:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
        Kernel driver in use: igb
        Kernel modules: igb
    

    Are there any bug reports out there about this regression issue re: the I219-LM controller? I can't find them. I'm hoping my plex server won't be affected if I upgrade to 18.04 since it's I217, and so's my other, already-upgraded server. But since the not-yet-upgraded server is also "-LM" I wonder if that's the relevant part...

  • CurunCurun Posts: 119Members, Plex Pass Plex Pass
    edited May 16

    @apiontek said:

    just tweaked my post for clarity?
    Using 18.04LTS as my server... I thought that was supposed issue, 18.04LTS as server?

  • apiontekapiontek Posts: 44Members, Plex Pass Plex Pass

    @Curun -- my bad, I misread your post. Per Achilles, the problem originally noted by ChuckPA at https://forums.plex.tv/discussion/319235/ubuntu-18-04-lts-initial-issues-warning seems to be tied to a specific ethernet controller -- what controller is in your 18.04LTS PlexServer? (I got mine with lspci | awk '/[Nn]et/ {print $1}' | xargs -i% lspci -ks %)

  • ChuckPAChuckPA Posts: 22,321Members, Plex Pass, Plex Ninja, Plex Team Member Plex Team Member

    I have updated the forum announcement to reflect Achilles' detailed information.

    If anyone see's an update come out, please let us know and we'll update as well here

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  • CurunCurun Posts: 119Members, Plex Pass Plex Pass
    edited May 16

    @apiontek said:
    @Curun -- my bad, I misread your post. Per Achilles, the problem originally noted by ChuckPA at https://forums.plex.tv/discussion/319235/ubuntu-18-04-lts-initial-issues-warning seems to be tied to a specific ethernet controller -- what controller is in your 18.04LTS PlexServer? (I got mine with lspci | awk '/[Nn]et/ {print $1}' | xargs -i% lspci -ks %)

    attached

        lspci | awk '/[Nn]et/ {print $1}' | xargs -i% lspci -ks %
        00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (7) I219-V (rev 10)
            Subsystem: Gigabyte Technology Co., Ltd Ethernet Connection (7) I219-V
            Kernel driver in use: e1000e
            Kernel modules: e1000e
    
  • apiontekapiontek Posts: 44Members, Plex Pass Plex Pass
    edited May 16

    Fascinating! OK, something specific to that NUC. From my results & @Curun 's results, seems like I'm safe to upgrade. Can't do it ASAP but when I do I'll re-test & update if I do enounter any problems.

    Thanks for the further research & input!

  • AchillesAchilles Posts: 2,261Members, Plex Pass, Plex Ninja Plex Ninja

    Found the culprit.
    https://www.spinics.net/lists/stable/msg200942.html
    On a Skull Canyon with a I219-LM starting with 4.14 kernel, TCP performance can be impacted.

  • AchillesAchilles Posts: 2,261Members, Plex Pass, Plex Ninja Plex Ninja

    I dropped the kernel to 4.13.16 on 18.04 LTS and the poor transmit performance was no longer observed. In order to use the current kernel 4.15.0 in 18.04 LTS, I had to issue these two commands to restore TCP performance with 18.04 LTS:

    sudo ethtool -K eno1 tso off
    sudo ethtool -K eno1 gso off
    
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