[Bug 232451] [igb] I210 NIC can not send more than ~670Mbit/s with flow control enabled.

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Fri Oct 19 17:12:18 UTC 2018


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: bugs at FreeBSD.org
          Reporter: lev at 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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