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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. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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