netdev - Re: [PATCH net-next] tcp: TSO packets automatic sizing

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Date:	Sat, 24 Aug 2013 19:52:09 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, ncardwell@...gle.com, ycheng@...gle.com,
	vanj@...gle.com, therbert@...gle.com
Subject: Re: [PATCH net-next] tcp: TSO packets automatic sizing

On Sat, 2013-08-24 at 22:46 -0400, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Fri, 23 Aug 2013 17:29:52 -0700
> 
> > After hearing many people over past years complaining against TSO being
> > bursty or even buggy, we are proud to present automatic sizing of TSO
> > packets.
> 
> Looks great.
> 
> > +	pr_debug("cwnd %u packets_out %u srtt %u -> rate = %llu bits\n",
> > +		 tp->snd_cwnd, tp->packets_out,
> > +		 jiffies_to_usecs(tp->srtt) >> 3, rate << 3);
> 
> I'd suggest you remove this though.
> 

Sure, but I found this very useful while debugging sch_fq.

CTRL=/sys/kernel/debug/dynamic_debug/control
echo "func tcp_rtt_estimator +p" >$CTRL
./netperf -l -1000000 -H lpq84
echo "func tcp_rtt_estimator -p" >$CTRL 



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