From: bert hubert <ahu@ds9a.nl>
To: P?l Halvorsen <paalh@ifi.uio.no>
Cc: linux-kernel@vger.kernel.org
Subject: Re: sendfile
Date: Wed, 30 Apr 2003 21:28:09 +0200 [thread overview]
Message-ID: <20030430192809.GA8961@outpost.ds9a.nl> (raw)
In-Reply-To: <Pine.SOL.4.51.0304302102300.12387@ellifu.ifi.uio.no>
On Wed, Apr 30, 2003 at 09:12:17PM +0200, P?l Halvorsen wrote:
> It could be useful for applications like streaming video where other
> protocols on top provide additional functionality or in a multicast
> session where TCP migth not be appropriate.
sendfile on UDP would try to send gigabits per second over ppp0...
> But should not the 2.4.X kernels have support for chained sk_buffs (like
> the BSD mbufs) meaning that support for scatter-gatter I/O from the NIC
> should be unneccessary to support zero-copy (i.e., NO in-memory data
> copy operations)?
No clue what you mean over here. Zero copy means different things to
different people. Sendfile eliminates the 'read(to buffer);write(buffer to
network);' copy.
Some network drivers again may eliminate the 'copy_with_checksum()' step,
allowing minus-one-copy, in zerocopy reference frame.
Regards,
bert
--
http://www.PowerDNS.com Open source, database driven DNS Software
http://lartc.org Linux Advanced Routing & Traffic Control HOWTO
next prev parent reply other threads:[~2003-04-30 19:15 UTC|newest]
Thread overview: 22+ 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 ` bert hubert [this message]
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 ` sendfile Chris Friesen
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 --
2001-05-24 8:44 sendfile Pål Halvorsen
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