https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232451
Bug ID: 232451
Summary: [igb] I210 NIC can not send more than ~670Mbit/s with
flow control enabled.
Product: Base System
Version: 11.2-STABLE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: l...@freebsd.org
I have server which is equipped with I210 NIC and has 11.2-STABLE installed.
With default config and MTU 9000 this server can not send faster than
~670Mbit/s on network without any other load (tested with iperf3).
If I set "sysctl dev.igb.0.fc" to 0, it easily sends 990-995Mbit/s at same
network to same client.
Other problem is, that after mtu change with "ifconfig igb mtu ..." speed drops
again, but "sysctl dev.igb.0.fc" is 0 still. To turn off flow control again it
is needed to flip "sysctl dev.igb.0.fc" to non-zero and to zero again.
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