netdev - Re: [PATCH v3 net-next 2/2] tcp: TCP_NOTSENT

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Message-ID: <20130723035202.GA32523@order.stressinduktion.org>
Date:	Tue, 23 Jul 2013 05:52:02 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Rick Jones <rick.jones2@...com>,
	netdev <netdev@...r.kernel.org>,
	Yuchung Cheng <ycheng@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [PATCH v3 net-next 2/2] tcp: TCP_NOTSENT_LOWAT socket option

On Mon, Jul 22, 2013 at 08:27:07PM -0700, Eric Dumazet wrote:
> Note this is not related to SO_SNDLOWAT (as SO_SNDLOWAT is
> defined as :
>  Specify the minimum number of bytes in the buffer until
>  the socket layer will pass the data to the protocol)

Oh, I had another understanding of SO_SNDLOWAT in my head: The minimum amount
of free write space in the socket buffer so that select/poll reports POLLOUT.

In my previous mail I was specifically referring to the optimization in
sk_stream_write_space() and not to the whole TCP_NOTSEND_LOWAT knob.

Thanks,

  Hannes

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