GbE Ethernet Port Issue Data Gathering Statistics Intel

[benjanyan]

1) 201-A64-DB110-02
    A64-DB-v1.1 2G
    C160358 04.11
2) RTL8211E  G2K40P2  GG10B
3) Asus N56U (Realtek RTL8367M chip for switch)
4) Not modded.
5) N/A
6) Run a Samba server on it so Gb Ethernet is nice (although I am of course limited by USB2.0 then)
7) PINE64 works at acceptable levels most of the time over Gb. Network slows to almost nothing occasionally. More explanation in my post here.

Code:

Linux aoba 3.10.102-2-pine64-longsleep #66 SMP PREEMPT Sat Jul 16 10:53:13 CEST 2016 aarch64 GNU/Linux yuki_n@aoba:~$ sudo ifconfig eth0 eth0      Link encap:Ethernet  HWaddr 36:c9:e3:f1:b8:05          inet addr:192.168.20.7  Bcast:192.168.20.255  Mask:255.255.255.0          inet6 addr: fe80::34c9:e3ff:fef1:b805/64 Scope:Link          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1          RX packets:5666217 errors:0 dropped:0 overruns:0 frame:0          TX packets:6714105 errors:0 dropped:0 overruns:0 carrier:0          collisions:0 txqueuelen:1000          RX bytes:6494935317 (6.0 GiB)  TX bytes:6641734676 (6.1 GiB)          Interrupt:114 yuki_n@aoba:~$ sudo ethtool eth0 Settings for eth0:        Supported ports: [ TP MII ]        Supported link modes:   10baseT/Half 10baseT/Full                                100baseT/Half 100baseT/Full                                1000baseT/Half 1000baseT/Full        Supported pause frame use: No        Supports auto-negotiation: Yes        Advertised link modes:  10baseT/Half 10baseT/Full                                100baseT/Half 100baseT/Full                                1000baseT/Half 1000baseT/Full        Advertised pause frame use: No        Advertised auto-negotiation: Yes        Speed: 1000Mb/s        Duplex: Full        Port: MII        PHYAD: 0        Transceiver: external        Auto-negotiation: on        Link detected: yes yuki_n@aoba:~$ iperf -c mashiro ------------------------------------------------------------ Client connecting to mashiro, TCP port 5001 TCP window size: 22.5 KByte (default) ------------------------------------------------------------ [  3] local 192.168.20.7 port 51133 connected with 192.168.20.6 port 5001 [ ID] Interval       Transfer     Bandwidth [  3]  0.0-10.0 sec   611 MBytes   512 Mbits/sec yuki_n@aoba:~$

Router reports (note FC OFF and dot3StatsFCSErrors which differ to other Gbit ethernet devices on my network) :

Code:

Port Link            : 1000 Mbps, Full Duplex, FC OFF MIB Counters ---------------------------------------- ifInOctets            : 4483548236 ifOutOctets            : 73064230 etherStatsMcastPkts        : 36667 etherStatsBcastPkts        : 4463 etherStatsFragments        : 0 etherStatsDropEvents        : 0 etherStatsUndersizePkts        : 0 etherStatsOversizePkts        : 0 etherStatsCollisions        : 0 dot3StatsFCSErrors        : 6840 dot3StatsSymbolErrors        : 0 dot3ControlInUnknownOpcodes    : 0 dot3InPauseFrames        : 0 dot3OutPauseFrames        : 0