RTL811E/Windows Poor performance

Frozennova · 22 Sep 2014 at 21:43

Trying to diagnose an issue that's causing slow speeds between my pc and my home server.

I have rule out hardware and narrowed this down to a windows specific issue, present on 7/8/8.1 with a mix of drivers from the newest to some older ones that are reported to be better.

both Debian and Linux Mint will both return 950M/bit speeds testing with iperf. About the best you are going to see with Gigabit due so a 5-10% overhead, while windows will not go above 750M/bit.

Link speed is negotiating correctly in Windows, I've tried connecting direct rather than through the switch they are currently connected to an I have tried from standard frame sizes right through to 9K MTU.

I also tried with a PCI Intel Pro Gigabit NIC which returns even worse speeds of around 500M/bit

edit: title should have been RTL8111E

Frozennova · 23 Sep 2014 at 07:13

SSD in both machines, irrelevant though using iperf as it's purely network bench doest rely on disk at all

Tried multiple ethernet cables, but as I mentioned in the OP this has to be a windows related issue as I installed Linux mint on a spare drive and performance I'd absolutely spot on.

Frozennova · 24 Sep 2014 at 11:25

Debian 7 on the server.

Nothing to do with SMB as it's not what I'm using to gauge network performance. Iperf is far more accurate

Frozennova · 24 Sep 2014 at 20:29

Debian/Windows

iperf -s
iperf -c IP -1 -t 30

750Mbit/s

Debian/Mint

same options

950Mbit/s

Debian system has remained the same the whole time, the windows/mint are exactly the same hardware as it's a dual boot.

Frozennova · 24 Sep 2014 at 21:00

Already tried with anti virus etc disabled. Also tried a diagnostic start too.

Might have to start digging through the NIC settings in device manager then, that or move to a *nix OS on my desktop