netdev - Re: [PATCHv2 net-next] cxgb4: Add low latency socket busy

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Message-Id: <20150204.235610.54093520486544328.davem@davemloft.net>
Date:	Wed, 04 Feb 2015 23:56:10 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	hariprasad@...lsio.com
Cc:	netdev@...r.kernel.org, leedom@...lsio.com, anish@...lsio.com,
	nirranjan@...lsio.com, kumaras@...lsio.com
Subject: Re: [PATCHv2 net-next] cxgb4: Add low latency socket busy_poll
 support

From: Hariprasad Shenai <hariprasad@...lsio.com>
Date: Wed,  4 Feb 2015 15:32:52 +0530

> cxgb_busy_poll, corresponding to ndo_busy_poll, gets called by the socket
> waiting for data.
> 
> With busy_poll enabled, improvement is seen in latency numbers as observed by
> collecting netperf TCP_RR numbers.
> Below are latency number, with and without busy-poll, in a switched environment
> for a particular msg size:
> netperf command: netperf -4 -H <ip> -l 30 -t TCP_RR -- -r1,1
> Latency without busy-poll: ~16.25 us
> Latency with busy-poll   : ~08.79 us
> 
> Based on original work by Kumar Sanghvi <kumaras@...lsio.com>
> 
> Signed-off-by: Hariprasad Shenai <hariprasad@...lsio.com>
> ---
> V2: fix napi poll return value for repoll, thanks to pointers by
>     Eric Dumazet <eric.dumazet@...il.com>

Applied, thanks.
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