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I was recently getting the following speeds when using the ookla speedtest cli...

$ speedtest

Speedtest by Ookla


  Server: ********
     ISP: TELUS



Idle Latency:     1.98 ms   (jitter: 0.08ms, low: 1.85ms, high: 2.05ms)
    Download:   913.40 Mbps (data used: 1.3 GB)

                  4.96 ms   (jitter: 0.86ms, low: 1.47ms, high: 10.53ms)
      Upload:   900.51 Mbps (data used: 1.2 GB)

                  4.99 ms   (jitter: 1.25ms, low: 1.52ms, high: 11.40ms)
 Packet Loss:     0.0%

Recently my speeds dropped to about 1/2 (i.e. ~500Mbps) and I can't figure out why...

I've done various troubleshooting and nothing has helped so far. Running out of ideas.

  • Rebooted
  • Checked physical cables. Laptop gets gigabit speeds using the same cable / switch port as the problem machine
  • Shutdown all docker containers and the docker services itself in case something was eating up bandwidth
  • Disabled ipv6

https://askubuntu.com/a/1232022/1636933

sudo vi /etc/gai.conf
Uncomment ::ffff:0:0/96  100

https://askubuntu.com/a/994916/1636933

sudo /sbin/ethtool eth0 # shows full duplex
docker network prune

sudo lshw -C network

  *-network                 
       description: Ethernet interface
       product: MCP79 Ethernet
       vendor: NVIDIA Corporation
       physical id: a
       bus info: pci@0000:00:0a.0
       logical name: enp0s10
       version: b1
       serial: 90:fb:a6:4c:7d:26
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 32 bits
       clock: 66MHz
       capabilities: pm bus_master cap_list ethernet physical mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=forcedeth driverversion=0.64 duplex=full ip=192.168.1.101 latency=0 link=yes maxlatency=20 mingnt=1 multicast=yes port=MII speed=1Gbit/s
       resources: irq:20 memory:fae7d000-fae7dfff ioport:d080(size=8) memory:fae7e800-fae7e8ff memory:fae7e400-fae7e40f
  *-network DISABLED
       description: Wireless interface
       product: RT3090 Wireless 802.11n 1T/1R PCIe
       vendor: Ralink corp.
       physical id: 0
       bus info: pci@0000:05:00.0
       logical name: wlp5s0
       version: 00
       serial: 70:f1:a1:40:20:67
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=rt2800pci driverversion=4.15.0-194-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11
       resources: irq:19 memory:febf0000-febfffff
  *-network
       description: Ethernet interface
       physical id: 1
       logical name: vethdde1b89
       serial: ba:25:08:f9:20:9e
       size: 10Gbit/s
       capabilities: ethernet physical
       configuration: autonegotiation=off broadcast=yes driver=veth driverversion=1.0 duplex=full link=yes multicast=yes port=twisted pair speed=10Gbit/s
user1636933
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