netdev - Re: ixgbe tuning reset when XDP is setup

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Date:   Fri, 15 Dec 2017 10:53:38 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     eric@...it.org
Cc:     netdev@...r.kernel.org, xdp-newbies@...r.kernel.org,
        pmanev@...mus-networks.com
Subject: Re: ixgbe tuning reset when XDP is setup

From: Eric Leblond <eric@...it.org>
Date: Fri, 15 Dec 2017 11:24:46 +0100

> Hello,
> 
> When using an ixgbe card with Suricata we are using the following
> commands to get a symmetric hash on RSS load balancing:
> 
> ./set_irq_affinity 0-15 eth3
> ethtool -X eth3 hkey 6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A:6D:5A equal 16
> ethtool -x eth3
> ethtool -n eth3
> 
> Then we start Suricata.
> 
> In my current experiment on XDP, I have Suricata that inject the eBPF
> program when starting. The consequence of that when using an ixgbe card
> is that the load balancing get reset and all interrupts are reaching
> the first core.

This definitely should _not_ be a side effect of enabling XDP on a device.