Intel 10GbE Tuning under freebsd

[Kip Macy]

Four very quick points:

- Enabling flowtable can help provided you don't have a large (greater
than a few thousand) number of peers.
- I have a patch under review to cache the rtentry (L3) and llentry
(L2) in the inpcb for TCP connections, which improves scaling at high
packet rates.
- You'll want to ensure that the number of transmit and receive queues
is getting configured properly (at least one per core up to the
maximum number supported by the cards)
- If you have very large numbers of connections you'll want to
increase the size of the TCB hash, to dramatically reduce the lookup
times when receiving packets.


I hope that helps a little bit.

Cheers,
Kip

On Thu, May 19, 2011 at 3:52 PM, William Salt
<williamejsalt at googlemail.com> wrote:
> Hi All,
>         I have just got a couple of 10GbE intel X520-DA2 cards to test. Im
> running freebsd 8.1 on a super micro intel xeon server, and a hp core 2 duo
> workstation, both machines have 4gb of ram.
> Both are attached via sfp+ cables to a brocade turbo iron switch, which
> simply has jumbo frames enabled.
>
> Initial testing was pretty basic, i simply enabled jumbo frames, and
> increased max send/recv buffer to 16MB, which should be more than enough.
> I then ran iperf and managed to get approximately 5gbps, i was expecting
> around 8.5gbps.
> However, i realise that the ix driver probably needs to be tuned, as well as
> the OS.
>
> After a bit of googling, i cant find a tuning guide under freebsd for 10GbE,
> or many recommendations, and wondered if anyone has already successfully
> managed to tune freebsd with intel 10gbe nics, to gain a higher throughput?
> If so, has anyone got any tips, or sample configs?
>
> Thanks in advance
> Will
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