From: Chris Friesen <cfriesen@nortelnetworks.com>
To: Mark Mielke <mark@mark.mielke.cc>
Cc: "Pål Halvorsen" <paalh@ifi.uio.no>, "bert hubert" <ahu@ds9a.nl>,
linux-kernel@vger.kernel.org
Subject: Re: sendfile
Date: Fri, 02 May 2003 00:19:25 -0400 [thread overview]
Message-ID: <3EB1F1CD.4060702@nortelnetworks.com> (raw)
In-Reply-To: 20030502024147.GA523@mark.mielke.cc
Mark Mielke wrote:
> As far as I understand, sendfile() still requires the data to get from the
> disk to a page in memory, similar to how send() referencing an mmap()'d page
> may cause a page fault, reading the data from disk to a page in memory. One
> copy each. I don't know of a kernel interface that lets data be copied from
> disk to ethernet card without involving a temporary copy to be in paged
> memory at some point in time... perhaps the iSCSI stuff can do this? I dunno.
According to this:
http://asia.cnet.com/builder/program/dev/0,39009360,39062783,00.htm
using sendfile() is easier on the CPU due to less trashing of the TLB.
I do get your point about protocol limitiations though.
Chris
--
Chris Friesen | MailStop: 043/33/F10
Nortel Networks | work: (613) 765-0557
3500 Carling Avenue | fax: (613) 765-2986
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next prev parent reply other threads:[~2003-05-02 4:07 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-30 14:28 sendfile Pål Halvorsen
2003-04-30 16:51 ` sendfile bert hubert
2003-04-30 19:12 ` sendfile Pål Halvorsen
2003-04-30 19:28 ` sendfile bert hubert
2003-04-30 21:57 ` sendfile Pål Halvorsen
2003-04-30 22:18 ` sendfile Mark Mielke
2003-04-30 22:34 ` sendfile Pål Halvorsen
2003-05-01 4:28 ` sendfile Mark Mielke
2003-05-01 15:25 ` sendfile Joseph Malicki
2003-05-01 21:17 ` sendfile Pål Halvorsen
2003-05-01 22:31 ` sendfile Chris Friesen
2003-05-01 23:32 ` sendfile Ketil Froyn
2003-05-02 9:02 ` sendfile Bernd Eckenfels
2003-05-02 2:41 ` sendfile Mark Mielke
2003-05-02 4:19 ` Chris Friesen [this message]
2003-05-02 21:06 ` sendfile Mark Mielke
2003-05-03 0:42 ` sendfile Miquel van Smoorenburg
2003-05-03 15:04 ` sendfile Mark Mielke
2003-05-03 12:52 ` sendfile Pål Halvorsen
2003-05-03 21:01 ` sendfile Pål Halvorsen
2003-05-04 0:53 ` sendfile Miquel van Smoorenburg
-- strict thread matches above, loose matches on Subject: below --
2005-06-06 6:24 sendfile Frederik Eaton
2005-06-06 9:09 ` sendfile Jan Blunck
2005-06-07 7:06 ` sendfile Frederik Eaton
2005-06-07 15:46 ` sendfile Jan Blunck
2001-05-24 8:44 sendfile Pål Halvorsen
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