Bandwidth Drops After Restarting Network

F

fast-forward

Hey Community,

I have a dedicated server at Hetzner:

Intel Xeon E3-1245
PLUSNIC 1 Gbit
Intel 82574L
HDD2x HDD SATA 3,0 TB Enterprise
Memory 4x 4096 MB DDR3 ECC

Installed is a FreeBSD 12.2

I have noticed that I am losing bandwidth by a factor of 3 by Downloading 1GB File by using scp.
Normally it shows 20mb/s for the first second but after some time downloading it over and over again
it shows 1mb/s for the first second. After downloading the whole 1 GB the difference is: 30mb/s vs 11mb/s

This happens either with time, or immediately after I restarted the network with:
service netif restart && service routing restart

I have no idea what is causing this. Any ideas?

Best Regards,
fast-forward
 
I've removed the ifconfig_em0_ipv6 setting and currently all is fine. But why ?

Code: 
keymap="de.kbd"
ifconfig_em0="inet 78.46.91.155 netmask 0xffffffe0"
defaultrouter="78.46.91.129"
# ifconfig_em0_ipv6="inet6 accept_rtadv"
sshd_enable="YES"
ntpd_enable="YES"
# Set dumpdev to "AUTO" to enable crash dumps, "NO" to disable
dumpdev="AUTO"
 
I download these files from a Hetzner EX42 server and I got 112MB/s from both (I have IPv6 disabled). Did you check if you have good speed from freebsd rescue mode?
 
When I wait for the download to complete, the difference is currently for my last test
21mb/s (FreeBSD) to 28mb/s (Linux).

But the first seconds the Linux machine has already loaded 7% and BSD 0%.

The short-term data throughput is higher. For a website that provides video content this seems important to me.

Already tried to turn off LSO and TSO ifconfig em0 -lro -tso nothing has changed.
 
Make sure to limit your downloads to IPv4. If I recall correctly Hetzner does something odd with regards to the way they implemented IPv6. So rule this out by forcing wget/curl/fetch to use IPv4.
 
When I load the BSD-file from Linux Box I also have a constant 112mb/s.
Have changed the ISP also constant 23mb/s

But with my ISP it works only with Linux but not with FreeBSD as long as I reboot the BSD Box.
Crazy
 
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