netdev - performance of two 82599 nics at a host

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Date:	Wed, 15 Oct 2014 17:52:23 +0700
From:	Bokhan Artem <art@....ru>
To:	netdev@...r.kernel.org
Subject: performance of two 82599 nics at a host

Hello, everyone.

I have two 82599 nics connected to different numa nodes. Each nic can 
recieve up to 12Mpps 64-byte packets.

But when I send traffic to both nics only 5Mpps+5Mpps can be recieved.

May someboby help if it's driver, kernel or hardware bottleneck?

Configuration:

2 x E5-2667 v2@...0GHz
3.14.19 kernel, 3.22.3 ixgbe
8 queues at each nic with affinity set

NIC1
--pkt/eth2- --pkt/eth5-
#recv #send:#recv #send
    0     0 :12.6M    0
    0     0 :12.7M    0
    0     0 :12.7M    0
    0     0 :12.7M    0
    0     0 :12.7M    0

NIC2
--pkt/eth2- --pkt/eth5-
#recv #send:#recv #send
12.7M    0 :   0     0
12.7M    0 :   0     0
12.6M    0 :   0     0
12.7M    0 :   0     0
12.6M    0 :   0     0

both
--pkt/eth2- --pkt/eth5-
#recv #send:#recv #send
5099k    0 :5758k    0
5467k    0 :5325k    0
5050k    0 :5432k    0
5206k    0 :5133k    0
5162k    0 :5164k    0

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