Slow network speeds Debian

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Slow network speeds Debian

Postby Goggel72 » 2020-12-12 20:56

Hi, I am setting up my first linux Debian (10.7) server for storage and ran into an issue.

When I was transferring data to it I noticed that the network speeds far below expectation, about half the speed I was expecting from a 1gigabit connection.
(onboard Intel Corporation I350 Gigabit Network Connection (rev 01)

So, I ran iperf3 a few times this was confirmed:
iperf 3 -c 192.168.1.103 -f M
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-10.00 sec 557 MBytes 55.7 MBytes/sec 0 sender
[ 5] 0.00-10.00 sec 555 MBytes 55.5 MBytes/sec receiver

After this I tried other distros to make sure it wasn't a Debian thing but got the same results.
Ubuntu 20.04 LTS
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-10.00 sec 592 MBytes 59.2 MBytes/sec sender
[ 5] 0.00-10.00 sec 591 MBytes 59.1 MBytes/sec receiver

Proxmox 6.2
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-10.00 sec 586 MBytes 58.6 MBytes/sec sender
[ 5] 0.00-10.00 sec 588 MBytes 58.8 MBytes/sec receiver

Then I noticed they are all based on Debian and the NIC's are all Intel, so I tried some OS not based on Debian

Centos linux release 7.9.2009 (core)
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-10.01 sec 1.09 GBytes 111 MBytes/sec sender
[ 5] 0.00-10.01 sec 1.08 GBytes 111 MBytes/sec receiver

Fedora 33
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-10.00 sec 1.09 GBytes 111 MBytes/sec sender
[ 5] 0.00-10.00 sec 1.09 GBytes 111 MBytes/sec receiver

Windows 10 Pro
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-10.00 sec 1.13 GBytes 113 MBytes/sec sender
[ 5] 0.00-10.00 sec 1.13 GBytes 113 MBytes/sec receiver

Here I got full gigabit speed which ruled out the hardware

Tested all this with different NIC's. all with the same results.
HP NC365T (Intel Corporation 82580 Gigabit Network Connection (rev 01)
Intel Gigabit CT desktop adapter - EXP19301CTBLK
Intel® PRO/1000 MT Quad Port Server Adapter -- My-0YT674-12402-99C-00PY

Has anyone an idea what is going on or how to solve this

Server:
Fujitsu TX300 - S8
2x Xeon E5-2670v2
64 GB RAM
Samsung EVO850 boot drive
Storage RAIDZ (4x HGST 8TB SAS3)
Goggel72
 
Posts: 1
Joined: 2020-12-12 19:09

Re: Slow network speeds Debian

Postby Head_on_a_Stick » 2020-12-13 10:26

Black Lives Matter

Debian buster-backports ISO image: for new hardware support
User avatar
Head_on_a_Stick
 
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Joined: 2014-06-01 17:46
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