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Date: Thu, 02 Jan 2003 18:40:04 -0800 (PST)
Message-Id: <20030102.184004.09755984.davem@redhat.com>
To: alan@lxorguk.ukuu.org.uk
Cc: lm@bitmover.com, tom@rhadamanthys.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] TCP Zero Copy for mmapped files
From: "David S. Miller" <davem@redhat.com>
In-Reply-To: <1041555419.24901.86.camel@irongate.swansea.linux.org.uk>
References: <1041549644.24829.66.camel@irongate.swansea.linux.org.uk>
	<20030102.151600.129375771.davem@redhat.com>
	<1041555419.24901.86.camel@irongate.swansea.linux.org.uk>
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   From: Alan Cox <alan@lxorguk.ukuu.org.uk>
   Date: 03 Jan 2003 00:56:59 +0000

   On Thu, 2003-01-02 at 23:16, David S. Miller wrote:    
   > With sendfile() all of this goes straight to the page cache directly
   > without a VMA lookup.
   
   With a nasty unpleasant splat the moment you do modification on the
   content at all. For static objects sendfile is certainly superior,
   
Sendfile does not protect against content changes to the
file contents.  We don't lock the pages, we merely grab
references to them for the network I/O.
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