netdev - Re: [PATCH v3 1/6] net: pad skb data and shinfo as a whole rather than individually

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Date:	Tue, 31 Jan 2012 14:35:27 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v3 1/6] net: pad skb data and shinfo as a whole rather
 than individually

Hi Eric,

On Wed, 2012-01-25 at 13:12 +0000, Eric Dumazet wrote:
> Le mercredi 25 janvier 2012 à 13:09 +0000, Ian Campbell a écrit :
> 
> > Can you elaborate on the specific benchmark you used there?
> 
> One machine was sending udp frames on my target (using pktgen)
> 
> Target was running a mono threaded udp receiver (one socket)

I've been playing with pktgen and I'm seeing more like 81,600-81,800 pps
from a UDP transmitter, measuring on the rx side using "bwm-ng -u
packets" and sinking the traffic with "nc -l -u -p 9 > /dev/null". The
numbers are the same with or without this series.

You mentioned numbers in the 820pps region -- is that really kilo-pps
(in which case I'm an order of magnitude down) or actually 820pps (in
which case I'm somehow a couple of orders of magnitude up).

I'm using a single NIC transmitter, no delay, 1000000 clones of each skb
and I've tried 60 and 1500 byte packets. In the 60 byte case I see more
like 50k pps

I'm in the process of setting up a receiver with a bnx2 but in the
meantime I feel like I'm making some obvious or fundamental flaw in my
method...

Any tips greatly appreciated.

Thanks,
Ian.

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