netdev - RE: [PATCH NEXT 3/5] qlcnic: vlan lro support

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Date:	Fri, 17 Sep 2010 02:10:32 -0500
From:	Amit Salecha <amit.salecha@...gic.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Ameen Rahman <ameen.rahman@...gic.com>,
	Anirban Chakraborty <anirban.chakraborty@...gic.com>
Subject: RE: [PATCH NEXT 3/5] qlcnic: vlan lro support



> -----Original Message-----
> From: Eric Dumazet [mailto:eric.dumazet@...il.com]
> Sent: Thursday, September 16, 2010 6:57 PM
> To: Amit Salecha
> Cc: davem@...emloft.net; netdev@...r.kernel.org; Ameen Rahman; Anirban
> Chakraborty
> Subject: Re: [PATCH NEXT 3/5] qlcnic: vlan lro support
> 
> Le jeudi 16 septembre 2010 à 06:14 -0700, Amit Kumar Salecha a écrit :
> > LRO + GRO + vlan rx accleration support, performance increases
> > around 20% and cpu utilization reduces around 70% on vlan interface.
> 
> Interesting. What is the workload that demonstrates such gains ?
> 
> 
Just to demonstrate decrease in cpu utilization further:
I have taken numbers with various load. I used iperf application to run tcp traffic on vlan interface.

Number of TCP connection	 Cpu  %idle		Cpu %idle
					 (w/o patch)	(with patch)

	8				34.14			63.01
	16				34.36			62.38
	32				33.86			62.18
	64				30.62			61.94
	128				29.33			61.13
	256				27.79			59.46
	512				25.33			59.38

There is around 80-90% of reduction in cpu utilization.

-Amit