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

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Message-ID: <20150204062436.GE30631@kumar-pc.asicdesigners.com>
Date:	Wed, 4 Feb 2015 12:24:37 +0600
From:	Kumar Sanghvi <kumaras@...lsio.com>
To:	Rick Jones <rick.jones2@...com>
CC:	Hariprasad Shenai <hariprasad@...lsio.com>,
	<netdev@...r.kernel.org>, <davem@...emloft.net>,
	<leedom@...lsio.com>, <anish@...lsio.com>, <nirranjan@...lsio.com>,
	<praveenm@...lsio.com>
Subject: Re: [PATCH net-next] cxgb4: Add low latency socket busy_poll support

Hi Rick,

On Tuesday, February 02/03/15, 2015 at 08:45:53 -0800, Rick Jones wrote:
> On 02/02/2015 09:20 PM, Hariprasad Shenai wrote:
> >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.
> 
> Which, not surprisingly, leads to the question - how much
> improvement? :)  Extra credit for including the change in
> netperf-reported service demands.
> 
> happy benchmarking,
> 
> rick jones
> 

netperf was not changed in this case. Rather, busy-polling was enabled globally by
setting sysctls busy_poll and busy_read.

We will post the improvement numbers when submitting V2.


Thanks,
Kumar.
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