netdev - Re: [PATCH 1/2 net-next] net: fec: add napi support to improve proformance

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Date:	Tue, 22 Jan 2013 22:21:11 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Frank Li <Frank.Li@...escale.com>
Cc:	lznuaa@...il.com, shawn.guo@...aro.org, B38611@...escale.com,
	davem@...emloft.net, linux-arm-kernel@...ts.infradead.org,
	netdev@...r.kernel.org, bhutchings@...arflare.com,
	s.hauer@...gutronix.de
Subject: Re: [PATCH 1/2 net-next] net: fec: add napi support to improve
 proformance

On Wed, 2013-01-23 at 12:12 +0800, Frank Li wrote:
> Add napi support
> 
> Before this patch
> 
>  iperf -s -i 1
>  ------------------------------------------------------------
>  Server listening on TCP port 5001
>  TCP window size: 85.3 KByte (default)
>  ------------------------------------------------------------
>  [  4] local 10.192.242.153 port 5001 connected with 10.192.242.138 port 50004
>  [ ID] Interval       Transfer     Bandwidth
>  [  4]  0.0- 1.0 sec  41.2 MBytes   345 Mbits/sec
>  [  4]  1.0- 2.0 sec  43.7 MBytes   367 Mbits/sec
>  [  4]  2.0- 3.0 sec  42.8 MBytes   359 Mbits/sec
>  [  4]  3.0- 4.0 sec  43.7 MBytes   367 Mbits/sec
>  [  4]  4.0- 5.0 sec  42.7 MBytes   359 Mbits/sec
>  [  4]  5.0- 6.0 sec  43.8 MBytes   367 Mbits/sec
>  [  4]  6.0- 7.0 sec  43.0 MBytes   361 Mbits/sec
> 
> After this patch
>  [  4]  2.0- 3.0 sec  51.6 MBytes   433 Mbits/sec
>  [  4]  3.0- 4.0 sec  51.8 MBytes   435 Mbits/sec
>  [  4]  4.0- 5.0 sec  52.2 MBytes   438 Mbits/sec
>  [  4]  5.0- 6.0 sec  52.1 MBytes   437 Mbits/sec
>  [  4]  6.0- 7.0 sec  52.1 MBytes   437 Mbits/sec
>  [  4]  7.0- 8.0 sec  52.3 MBytes   439 Mbits/sec

Strange, as you still call netif_rx()

NAPI should call netif_receive_skb() instead



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