netdev - Re: ixgbe RSS not working as expected with 8021q and bridging

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Message-ID: <20091215172119.GF20231@esk.cs.usu.edu>
Date:	Tue, 15 Dec 2009 10:21:19 -0700
From:	Eldon Koyle <esk-netdev@....cs.usu.edu>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: ixgbe RSS not working as expected with 8021q and bridging

On  Dec 11  1:11+0100, Eric Dumazet wrote:
> Le 11/12/2009 00:11, Eldon Koyle a écrit :
> > We have built a firewall with two 10 Gbit interfaces (intel 82598EB) and
> > are doing some testing.  A simple bridge between the two interfaces acts
> > as expected with packets being distributed fairly evenly across all of
> > the rx/tx queues.
> > 
> > We then switched to tagged vlans on both interfaces (10 vlans each, 8
> > source and 8 dest addresses per vlan) and bridged eth0.N to eth1.N, and
> > many of our queues (and CPUs) remained idle, and all of our VLAN traffic
> > went out on the same tx queue.  Are multiple transmit queues supported
> > with 802.1q?  How do we figure out what is causing some of our receive
> > queues to be unused?
> > 
> > We are using 2.6.31 (from Debian) and ixgbe-2.0.44.14 .
> > 
> 
> You need more recent kernel (2.6.32) to get multi queue support on vlans, sorry.

Excellent.  2.6.32 solved half of the problem.  Now, we are using the
same number of rx and tx queues.  We are still seeing no packets on 3 of
our 8 rx queues on each interface, though (no packets on 2, 4 or 6).
Does the card assign queues in hardware, or is that handled by the
kernel?

-- 
Eldon Koyle
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