[Bug 287873] bad performance of devd(8) in stable/14 due to its hyperv.conf

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287873

            Bug ID: 287873
           Summary: bad performance of devd(8) in stable/14 due to its
                    hyperv.conf
           Product: Base System
           Version: 14.3-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: eugen@freebsd.org
                CC: imp@FreeBSD.org, sephe@freebsd.org

"service devd start" runs awfully slow (over 17 minutes in my case) for bare
metal server having lots of vlans (800+) created with custom rc.d script before
start of devd.

Part of the problem is in /sbin/ifconfig's inefficiency if it uses netlink in
14.3-STABLE but another part is in the /etc/devd/hyperv.conf that has the
following:

notify 10 {
        match "system"          "ETHERNET";
        match "type"            "IFATTACH";
        action "/usr/libexec/hyperv/hyperv_vfattach $subsystem 0";
};

So, devd needlessly calls /usr/libexec/hyperv/hyperv_vfattach for every vlan
created with bare metal server.

For additional details please take a look at
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287872

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