netdev - Re: [PATCH net-next] tcp: add tcpi_segs_in and tcpi_segs_out to tcp

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Message-ID: <20150521123845.GQ2298@localhost.localdomain>
Date:	Thu, 21 May 2015 09:38:45 -0300
From:	Marcelo Ricardo Leitner <mleitner@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Rick Jones <rick.jones2@...com>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Yuchung Cheng <ycheng@...gle.com>,
	Matt Mathis <mattmathis@...gle.com>,
	Craig Gallek <cgallek@...gle.com>, Martin Lau <kafai@...com>,
	Chris Rapier <rapier@....edu>
Subject: Re: [PATCH net-next] tcp: add tcpi_segs_in and tcpi_segs_out to
 tcp_info

On Wed, May 20, 2015 at 05:52:34PM -0700, Eric Dumazet wrote:
> On Wed, 2015-05-20 at 17:48 -0700, Rick Jones wrote:
> > On 05/20/2015 05:37 PM, Eric Dumazet wrote:
> > 
> > > Anyway, if we can send tcp data at 100Gbits on one flow, I guess we are
> > > doing a terrific job and do not need to tweak TCP stack anymore ;)
> > 
> > :)
> > 
> 
> Note that I have no particular strong feelings with these counters being
> 32 or 64bits. Its adding 8 extra bytes and a bit more overhead, nothing
> more.

And if they really need an absolute number, 500s is still pretty much
enough for polling these and adding the delta to some local u64 var.

  Marcelo
  
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