From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "David S. Miller" <davem@redhat.com>
Cc: lm@bitmover.com, tom@rhadamanthys.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] TCP Zero Copy for mmapped files
Date: 03 Jan 2003 00:56:59 +0000 [thread overview]
Message-ID: <1041555419.24901.86.camel@irongate.swansea.linux.org.uk> (raw)
In-Reply-To: <20030102.151600.129375771.davem@redhat.com>
On Thu, 2003-01-02 at 23:16, David S. Miller wrote:
> It depends how predictable your content is. With a 64bit box and a porn
> server its probably quite tidy
>
> Let's say you have infinite VM (which is what 64-bit almost is :) then
> the cost is setting up all of these useless VMAs for each and every
> file (which is a 1 time cost, ok), and also the VMA lookup each
> write() call.
>
> 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,
next prev parent reply other threads:[~2003-01-03 0:05 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-30 1:09 Thomas Ogrisegg
2002-12-30 1:29 ` Larry McVoy
2003-01-02 6:37 ` David S. Miller
2003-01-02 22:12 ` Thomas Ogrisegg
2003-01-02 22:28 ` Larry McVoy
2003-01-02 23:20 ` Alan Cox
2003-01-02 23:16 ` David S. Miller
2003-01-03 0:56 ` Alan Cox [this message]
2003-01-03 2:40 ` David S. Miller
2003-01-03 2:41 ` Linus Torvalds
2003-01-02 23:13 ` David S. Miller
2003-01-03 0:45 ` Thomas Ogrisegg
2003-01-03 1:01 ` Larry McVoy
2003-01-03 1:59 ` Alan Cox
2003-01-06 14:36 ` Gianni Tedesco
2003-01-06 23:29 ` David S. Miller
2003-01-03 1:56 ` Alan Cox
2003-01-03 1:27 ` Larry McVoy
2003-01-03 2:42 ` David S. Miller
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