In addition to that I'd look for fragmentation. When one packet becomes
two packets that has to double the impact of the latency.
On 11/15/2019 7:56 PM, Forrest Christian (List Account) wrote:
Have you checked the latency to the speedtest servers?
Have you captured the speedtest with a capture tool (wireshark) and
looked for retransmissions?
Even though it has largely not a problem anymore, latency can affect
TCP/IP performance. Also, even tiny packet loss can cause problems
in obtaining full speed.
Is their iperf server perhaps running UDP and yours running TCP?
On Fri, Nov 15, 2019 at 5:12 PM Matt Hoppes
<mattli...@rivervalleyinternet.net
<mailto:mattli...@rivervalleyinternet.net>> wrote:
I’m at a loss on this one.
We have a circuit with a fiber provider that aggregate at prime
time can hit 800mbps download.
However, with a high end laptop connected directly to the fiber
NID we can’t get more than 200-250mbps sustained download to any
speed test (speedtest.net <http://speedtest.net>, fast.com
<http://fast.com>, speed.ui.com <http://speed.ui.com>) and it just
starts slowly going down. Upload is around 800mbps.
Same laptop on a Level3 circuit will easily hit gigabit in both
directions.
We setup an iperf server and see the same thing. The provider
brings an iperf server in and they can hit the proper speeds going
to an off net iperf server they have. Provider speed tests to our
iperf server and gets the slower speeds.
They say because they can’t find an issue when using their iperf
server there is no issue.
I don’t even know what to suggest at this point.
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