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Network Performance Degrading over random amount of time

Hi List,
maybe you have a clue about the issues im having since several months.
My Homeserver is running Debian Jessy right now, the network issues where there with wheezy aswell. after a fresh boot my network behaves like it should archiving near gbit speeds which is nice, after a random amount of uptime though my throughput degrades below 100mbit network speeds (about ~3.5MB/s)
i measured using iperf.

Current Hardware:

- Asus P8H67-M PRO
- Intel(R) Core(TM) i3-2100 CPU @ 3.10GHz
- 16 GB DDR3 Ram (2*8GB Kingston ram)
- Intel Corporation 82541PI Gigabit Ethernet Controller
- TP-Link 8-Port gbit switches (2 of em between home-server and clients)

Ive tried diffrent things so far:

- Switched from a switched cabling setup to Crosslink.
- Swapped out the cheap asrock motherboard with asus
- Changed from onboard realtek network chip to PCI Intel Gbit card
- Reinstalled OS several times
- Testing from diffrent clients (Win 7, Linux Mint, Debian, Ubuntu)
- Downloading vendor drivers and using them instead of the kernel inbuild ones

Nothing so far had worked to get my gbit speeds stable over a few days.

im open to ANY suggestions here even if they involve building a custom kernel or other magical hakkery ;D

Lukas Wingerberg

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