From: torvalds@transmeta.com (Linus Torvalds)
To: linux-kernel@vger.kernel.org
Subject: Re: Is sendfile all that sexy?
Date: 19 Jan 2001 13:45:09 -0800 [thread overview]
Message-ID: <94ach5$mcs$1@penguin.transmeta.com> (raw)
In-Reply-To: <Pine.GSO.4.10.10101190951390.23899-100000@zeus.fh-brandenburg.de> <200101192018.XAA25263@ms2.inr.ac.ru>
In article <200101192018.XAA25263@ms2.inr.ac.ru>,
<kuznet@ms2.inr.ac.ru> wrote:
>Hello!
>
>> It's about direct i/o from/to pages,
>
>Yes. Formally, there are no problems to send to tcp directly from io space.
Actually, as long as there is no "struct page" there _are_ problems.
This is why the NUMA stuff was brought up - it would require that there
be a mem_map for the PCI pages.. (to do ref-counting etc).
>But could someone explain me one thing. Does bus-mastering
>from io really work? And if it does, is it enough fast?
>At least, looking at my book on pci, I do not understand
>how such transfers are able to use bursts. MRM is banned for them...
It does work at least on some hardware. But no, I don't think you can
depend on bursting (but I don't see why it couldn't work in theory).
Linus
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next prev parent reply other threads:[~2001-01-19 21:45 UTC|newest]
Thread overview: 109+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-17 15:02 Is sendfile all that sexy? Ben Mansell
2000-01-01 2:10 ` Pavel Machek
2001-01-17 19:32 ` Linus Torvalds
2001-01-18 2:34 ` Olivier Galibert
2001-01-21 21:22 ` LA Walsh
2001-01-18 8:23 ` Rogier Wolff
2001-01-18 10:01 ` Andreas Dilger
2001-01-18 11:04 ` Russell Leighton
2001-01-18 16:36 ` Larry McVoy
2001-01-19 1:53 ` Linus Torvalds
2001-01-18 16:24 ` Linus Torvalds
2001-01-18 18:46 ` Kai Henningsen
2001-01-18 18:58 ` Roman Zippel
2001-01-18 19:42 ` Linus Torvalds
2001-01-19 0:18 ` Roman Zippel
2001-01-19 1:14 ` Linus Torvalds
2001-01-19 6:57 ` Alan Cox
2001-01-19 10:13 ` Roman Zippel
2001-01-19 10:55 ` Andre Hedrick
2001-01-19 20:18 ` kuznet
2001-01-19 21:45 ` Linus Torvalds [this message]
2001-01-20 18:53 ` kuznet
2001-01-20 19:26 ` Linus Torvalds
2001-01-20 21:20 ` Roman Zippel
2001-01-21 0:25 ` Linus Torvalds
2001-01-21 2:03 ` Roman Zippel
2001-01-21 18:00 ` kuznet
2001-01-21 23:21 ` David Woodhouse
2001-01-20 15:36 ` Kai Henningsen
2001-01-20 21:01 ` Linus Torvalds
2001-01-20 21:10 ` Mo McKinlay
2001-01-20 22:24 ` Roman Zippel
2001-01-21 0:33 ` Linus Torvalds
2001-01-21 1:29 ` David Schwartz
2001-01-21 2:42 ` Roman Zippel
2001-01-21 9:52 ` James Sutherland
2001-01-21 10:02 ` Ingo Molnar
2001-01-22 9:52 ` Helge Hafting
2001-01-22 13:00 ` James Sutherland
2001-01-23 9:01 ` Helge Hafting
2001-01-23 9:37 ` James Sutherland
2001-01-18 19:51 ` Rick Jones
2001-01-18 12:17 ` Peter Samuelson
2001-01-22 18:13 ` Val Henson
2001-01-22 18:27 ` David Lang
2001-01-22 19:37 ` Val Henson
2001-01-22 20:01 ` David Lang
2001-01-22 22:04 ` Ion Badulescu
2001-01-22 18:54 ` Linus Torvalds
-- strict thread matches above, loose matches on Subject: below --
2001-01-24 15:12 Sasi Peter
2001-01-24 15:29 ` James Sutherland
2001-01-25 1:11 ` Alan Cox
2001-01-25 9:06 ` James Sutherland
2001-01-25 10:42 ` bert hubert
2001-01-25 12:14 ` James Sutherland
[not found] <Pine.LNX.4.10.10101190911130.10218-100000@penguin.transmeta.com>
2001-01-19 17:23 ` Rogier Wolff
2001-01-16 13:50 Andries.Brouwer
2001-01-17 6:56 ` Ton Hospel
2001-01-17 7:31 ` Steve VanDevender
2001-01-17 8:09 ` Ton Hospel
2001-01-14 18:29 jamal
2001-01-14 18:50 ` Ingo Molnar
2001-01-14 19:02 ` jamal
2001-01-14 19:09 ` Ingo Molnar
2001-01-14 19:18 ` jamal
2001-01-14 20:22 ` Linus Torvalds
2001-01-14 20:38 ` Ingo Molnar
2001-01-14 21:44 ` Linus Torvalds
2001-01-14 21:49 ` Ingo Molnar
2001-01-14 21:54 ` Gerhard Mack
2001-01-14 22:40 ` Linus Torvalds
2001-01-14 22:45 ` J Sloan
2001-01-15 20:15 ` H. Peter Anvin
2001-01-15 3:43 ` Michael Peddemors
2001-01-15 13:02 ` Florian Weimer
2001-01-15 13:45 ` Tristan Greaves
2001-01-15 1:14 ` Dan Hollis
2001-01-15 15:24 ` Jonathan Thackray
2001-01-15 15:36 ` Matti Aarnio
2001-01-15 20:17 ` H. Peter Anvin
2001-01-15 16:05 ` dean gaudet
2001-01-15 18:34 ` Jonathan Thackray
2001-01-15 18:46 ` Linus Torvalds
2001-01-15 18:58 ` dean gaudet
2001-01-15 19:41 ` Ingo Molnar
2001-01-15 20:33 ` Albert D. Cahalan
2001-01-15 21:00 ` Linus Torvalds
2001-01-16 10:40 ` Felix von Leitner
2001-01-16 11:56 ` Peter Samuelson
2001-01-16 12:37 ` Ingo Molnar
2001-01-16 12:42 ` Ingo Molnar
2001-01-16 12:47 ` Felix von Leitner
2001-01-16 13:48 ` Jamie Lokier
2001-01-16 14:20 ` Felix von Leitner
2001-01-16 15:05 ` David L. Parsley
2001-01-16 15:05 ` Jakub Jelinek
2001-01-16 15:46 ` David L. Parsley
2001-01-18 14:00 ` Laramie Leavitt
2001-01-17 19:27 ` dean gaudet
2001-01-24 0:58 ` Sasi Peter
2001-01-24 8:44 ` James Sutherland
2001-01-25 10:20 ` Anton Blanchard
2001-01-25 10:58 ` Sasi Peter
2001-01-26 6:10 ` Anton Blanchard
2001-01-26 11:46 ` David S. Miller
2001-01-26 14:12 ` Anton Blanchard
2001-01-15 23:16 ` Pavel Machek
2001-01-16 13:47 ` jamal
2001-01-16 14:41 ` Pavel Machek
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