netdev - Re: [PATCH net-next 1/2] tcp_cubic: add SNMP counters to track how effective is Hystart

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Message-Id: <20141209.145838.2277992704178215634.davem@davemloft.net>
Date:	Tue, 09 Dec 2014 14:58:38 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, nanditad@...gle.com, ncardwell@...gle.com,
	ycheng@...gle.com, sangtae.ha@...il.com
Subject: Re: [PATCH net-next 1/2] tcp_cubic: add SNMP counters to track how
 effective is Hystart

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 04 Dec 2014 16:13:23 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> When deploying FQ pacing, one thing we noticed is that CUBIC Hystart
> triggers too soon.
> 
> Having SNMP counters to have an idea of how often the various Hystart
> methods trigger is useful prior to any modifications.
> 
> This patch adds SNMP counters tracking, how many time "ack train" or
> "Delay" based Hystart triggers, and cumulative sum of cwnd at the time
> Hystart decided to end SS (Slow Start)
> 
> myhost:~# nstat -a | grep Hystart
> TcpExtTCPHystartTrainDetect     9                  0.0
> TcpExtTCPHystartTrainCwnd       20650              0.0
> TcpExtTCPHystartDelayDetect     10                 0.0
> TcpExtTCPHystartDelayCwnd       360                0.0
> 
> ->
>  Train detection was triggered 9 times, and average cwnd was
>  20650/9=2294,
>  Delay detection was triggered 10 times and average cwnd was 36
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.
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