Date: Tue, 17 Nov 2015 08:55:03 -0700 From: Alan Somers <asomers@freebsd.org> To: Johan Hendriks <joh.hendriks@gmail.com> Cc: FreeBSD <freebsd-stable@freebsd.org> Subject: Re: LACP with 3 interfaces. Message-ID: <CAOtMX2gghJMabmYbPze8%2Bm4okPViixtgWCW0aR6CSON45f_05A@mail.gmail.com> In-Reply-To: <564B4736.3000100@gmail.com> References: <564B4736.3000100@gmail.com>
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On Tue, Nov 17, 2015 at 8:26 AM, Johan Hendriks <joh.hendriks@gmail.com> wrote: > Is there something we can do to make sure lagg0 uses all the interfaces. Nope. LACP doesn't actively load balance its interfaces. Each flow gets assigned to a single interface based on a hash of the source and destination MACs, IP addresses, and TCP/UDP ports. With many clients, all interfaces will probably be used, but with few clients, there's a lot of luck involved. If you want more bandwidth, you can try fiddling with IP addresses and port numbers to influence the hash function, but even if you get it to distribute the way you want, all your work may be undone by a reboot. The best option is to buy a 10Gbps NIC for the server. They aren't too expensive, anymore, though the switches are still pricey. A cheaper option, if you'll only ever have 4 clients, is to discard the lagg and assign a separate IP address to each igb port, then manually distribute those addresses amongst your clients. If you do this, you unfortunately won't gain the reliability features of LACP. -Alan
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