netdev - RE: Using ethernet device as efficient small packet generator

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Date:	Wed, 22 Dec 2010 16:59:18 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jon Zhou <Jon.Zhou@...u.com>
Cc:	"juice@...gman.org" <juice@...gman.org>,
	Stephen Hemminger <shemminger@...tta.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: Using ethernet device as efficient small packet generator

Le mercredi 22 décembre 2010 à 07:48 -0800, Jon Zhou a écrit :
> 

> Hi eric, any special setting in pktgen.conf?
> 
> PGDEV=/proc/net/pktgen/kpktgend_0
>   echo "Removing all devices"
>  pgset "rem_device_all"
>   echo "Adding eth1-fp-0" //or eth1?

eth1

>  pgset "add_device eth1"
>   echo "Setting max_before_softirq 10000"
>  pgset "max_before_softirq 10000"

Not sure you need to tweak max_before_softirq (I never did)

> 
> All things I need to do is set cpu affinity and start 8 pktgen threads? (PGDEV=/proc/net/pktgen/kpktgend_0~7 with "eth1")

Yes, but you must also use queue_map_min and queue_map_max pktgen
parameters so that each cpu manipulates its own 'queue'

CPU 0 : 

   pgset "queue_map_min 0"
   pgset "queue_map_max 0"

...

CPU 3 : 

   pgset "queue_map_min 3"
   pgset "queue_map_max 3"




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