From: David Miller <davem@davemloft.net>
To: hariprasad@chelsio.com
Cc: netdev@vger.kernel.org, leedom@chelsio.com, anish@chelsio.com,
nirranjan@chelsio.com, kumaras@chelsio.com
Subject: Re: [PATCHv2 net-next] cxgb4: Add low latency socket busy_poll support
Date: Wed, 04 Feb 2015 23:56:10 -0800 (PST) [thread overview]
Message-ID: <20150204.235610.54093520486544328.davem@davemloft.net> (raw)
In-Reply-To: <1423044172-23586-1-git-send-email-hariprasad@chelsio.com>
From: Hariprasad Shenai <hariprasad@chelsio.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@chelsio.com>
>
> Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
> ---
> V2: fix napi poll return value for repoll, thanks to pointers by
> Eric Dumazet <eric.dumazet@gmail.com>
Applied, thanks.
prev parent reply other threads:[~2015-02-05 7:56 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-04 10:02 [PATCHv2 net-next] cxgb4: Add low latency socket busy_poll support Hariprasad Shenai
2015-02-05 7:56 ` David Miller [this message]
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