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Recently switched my home server to Ubuntu 20.04 LTS. I'm somewhat new to linux but I was able to get pretty much everything up and running.

I am however, facing a weird issue regarding LAN transfer speeds. Here's an excerpt from iper3

$ iperf3 -s
-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------
Accepted connection from 192.168.2.114, port 35492
[  5] local 192.168.2.150 port 5201 connected to 192.168.2.114 port 35494
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  70.2 MBytes   589 Mbits/sec    0    574 KBytes       
[  5]   1.00-2.00   sec  70.9 MBytes   595 Mbits/sec    0    660 KBytes       
[  5]   2.00-3.00   sec  70.0 MBytes   587 Mbits/sec    0    724 KBytes       
[  5]   3.00-4.00   sec  70.0 MBytes   587 Mbits/sec    0    724 KBytes       
[  5]   4.00-5.00   sec  68.8 MBytes   577 Mbits/sec    0    800 KBytes       
[  5]   5.00-6.00   sec  70.0 MBytes   587 Mbits/sec    0    885 KBytes       
[  5]   6.00-7.00   sec  70.0 MBytes   587 Mbits/sec    0    885 KBytes       
[  5]   7.00-8.00   sec  70.0 MBytes   587 Mbits/sec    0    885 KBytes       
[  5]   8.00-9.00   sec  70.0 MBytes   587 Mbits/sec    0    885 KBytes       
[  5]   9.00-10.00  sec  70.0 MBytes   587 Mbits/sec    0    974 KBytes       
[  5]  10.00-10.03  sec  2.50 MBytes   603 Mbits/sec    0    974 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.03  sec   702 MBytes   587 Mbits/sec    0             sender
-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------
Accepted connection from 192.168.2.114, port 35534
[  5] local 192.168.2.150 port 5201 connected to 192.168.2.114 port 35536
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.00   sec   107 MBytes   901 Mbits/sec                  
[  5]   1.00-2.00   sec   111 MBytes   931 Mbits/sec                  
[  5]   2.00-3.00   sec   110 MBytes   926 Mbits/sec                  
[  5]   3.00-4.00   sec   111 MBytes   929 Mbits/sec                  
[  5]   4.00-5.00   sec   111 MBytes   929 Mbits/sec                  
[  5]   5.00-6.00   sec   111 MBytes   929 Mbits/sec                  
[  5]   6.00-7.00   sec   111 MBytes   929 Mbits/sec                  
[  5]   7.00-8.00   sec   111 MBytes   932 Mbits/sec                  
[  5]   8.00-9.00   sec   111 MBytes   933 Mbits/sec                  
[  5]   9.00-10.00  sec   112 MBytes   939 Mbits/sec                  
[  5]  10.00-10.05  sec  4.43 MBytes   727 Mbits/sec                  
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-10.05  sec  1.08 GBytes   927 Mbits/sec                  receiver
-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------

And lspci -v

sudo lspci -v
0c:00.0 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme BCM5761 Gigabit Ethernet PCIe (rev 10)
    Subsystem: Dell NetXtreme BCM5761 Gigabit Ethernet PCIe
    Flags: bus master, fast devsel, latency 0, IRQ 38
    Memory at f7c10000 (64-bit, non-prefetchable) [size=64K]
    Memory at f7c00000 (64-bit, non-prefetchable) [size=64K]
    Capabilities: [48] Power Management version 3
    Capabilities: [40] Vital Product Data
    Capabilities: [60] Vendor Specific Information: Len=6c <?>
    Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Capabilities: [cc] Express Endpoint, MSI 00
    Capabilities: [100] Advanced Error Reporting
    Capabilities: [13c] Virtual Channel
    Capabilities: [160] Device Serial Number f0-1f-af-ff-fe-36-25-22
    Capabilities: [16c] Power Budgeting <?>
    Kernel driver in use: tg3
    Kernel modules: tg3
sudo lspci
00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04)
00:16.0 Communication controller: Intel Corporation 7 Series/C216 Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 7 Series/C216 Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 7 Series/C216 Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 7 Series/C216 Chipset Family PCI Express Root Port 1 (rev c4)
00:1c.1 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 2 (rev c4)
00:1c.2 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 3 (rev c4)
00:1c.3 PCI bridge: Intel Corporation 7 Series/C216 Chipset Family PCI Express Root Port 4 (rev c4)
00:1c.5 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 6 (rev c4)
00:1c.6 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 7 (rev c4)
00:1d.0 USB controller: Intel Corporation 7 Series/C216 Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation HM77 Express Chipset LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 7 Series Chipset Family 6-port SATA Controller [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 7 Series/C216 Chipset Family SMBus Controller (rev 04)
02:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205 [Taylor Peak] (rev 34)
0b:00.0 SD Host controller: O2 Micro, Inc. OZ600FJ0/OZ900FJ0/OZ600FJS SD/MMC Card Reader Controller (rev 05)
0c:00.0 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme BCM5761 Gigabit Ethernet PCIe (rev 10)
$ sudo lshw -c network
*-network
       description: Ethernet interface
       product: NetXtreme BCM5761 Gigabit Ethernet PCIe
       vendor: Broadcom Inc. and subsidiaries
       physical id: 0
       bus info: pci@0000:0c:00.0
       logical name: enp12s0
       version: 10
       serial: f0:1f:af:36:25:22
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.137 duplex=full firmware=5761-v3.80 ip=192.168.2.150 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
       resources: irq:38 memory:f7c10000-f7c1ffff memory:f7c00000-f7c0ffff
$ ethtool enp12s0
Settings for enp12s0:
    Supported ports: [ TP ]
    Supported link modes:   10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Half 1000baseT/Full 
    Supported pause frame use: No
    Supports auto-negotiation: Yes
    Supported FEC modes: Not reported
    Advertised link modes:  10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Half 1000baseT/Full 
    Advertised pause frame use: Symmetric
    Advertised auto-negotiation: Yes
    Advertised FEC modes: Not reported
    Link partner advertised link modes:  10baseT/Half 10baseT/Full 
                                         100baseT/Half 100baseT/Full 
                                         1000baseT/Full 
    Link partner advertised pause frame use: Symmetric
    Link partner advertised auto-negotiation: Yes
    Link partner advertised FEC modes: Not reported
    Speed: 1000Mb/s
    Duplex: Full
    Port: Twisted Pair
    PHYAD: 1
    Transceiver: internal
    Auto-negotiation: on
    MDI-X: off
Cannot get wake-on-lan settings: Operation not permitted
    Current message level: 0x000000ff (255)
                   drv probe link timer ifdown ifup rx_err tx_err
    Link detected: yes

I've tried copying from Samba Shares as well but it is limited to 75MB/s or 600Mb/s. When I was on Windows 10, I was able to get 900Mb/s+ both up/down on iperf and LAN transfers.

Any help at all will be appreciated! Dell E5430 Laptop

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