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From: Peter Chubb <peter@chubb.wattle.id.au>
To: Chris Friesen <cfriesen@nortelnetworks.com>
Cc: Mike Waychison <Michael.Waychison@sun.com>,
	Linus Torvalds <torvalds@osdl.org>,
	Alan Cox <alan@lxorguk.ukuu.org.uk>,
	Oleg Nesterov <oleg@tv-sign.ru>,
	William Lee Irwin III <wli@holomorphy.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Make pipe data structure be a circular list of pages, rather than
Date: Fri, 14 Jan 2005 21:15:38 +1100	[thread overview]
Message-ID: <16871.39882.69994.86833@wombat.chubb.wattle.id.au> (raw)
In-Reply-To: <41DF1F3D.3030006@nortelnetworks.com>

>>>>> "Chris" == Chris Friesen <cfriesen@nortelnetworks.com> writes:

Chris> Mike Waychison wrote:
>> This got me to thinking about how you can heuristically optimize
>> away coalescing support and still allow PAGE_SIZE bytes minimum in
>> the effective buffer.

Chris> While coalescing may be a win in some cases, there should also
Chris> be some way to tell the kernel to NOT coalesce, to handle the
Chris> case where you want minimum latency at the cost of some
Chris> throughput.

SysVr4 pipes used to have two modes: a `legacy' mode that coalesced
data, and a `message' mode that preserved message boundaries.  Seems
to me that we could be about to have the latter in Linux...

--
Dr Peter Chubb  http://www.gelato.unsw.edu.au  peterc AT gelato.unsw.edu.au
The technical we do immediately,  the political takes *forever*



  parent reply	other threads:[~2005-01-14 10:38 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-01-07 14:30 Make pipe data structure be a circular list of pages, rather than Oleg Nesterov
2005-01-07 15:45 ` Alan Cox
2005-01-07 17:23   ` Linus Torvalds
2005-01-08 18:25     ` Hugh Dickins
2005-01-08 18:54       ` Linus Torvalds
2005-01-07 16:17 ` Linus Torvalds
2005-01-07 16:06   ` Alan Cox
2005-01-07 17:33     ` Linus Torvalds
2005-01-07 17:48       ` Linus Torvalds
2005-01-07 20:59         ` Mike Waychison
2005-01-07 23:46           ` Chris Friesen
2005-01-08 21:38             ` Lee Revell
2005-01-08 21:51               ` Linus Torvalds
2005-01-08 22:02                 ` Lee Revell
2005-01-08 22:29                 ` Davide Libenzi
2005-01-09  4:07                 ` Linus Torvalds
2005-01-09 23:19                   ` Davide Libenzi
2005-01-14 10:15             ` Peter Chubb [this message]
2005-01-07 21:59         ` Linus Torvalds
2005-01-07 22:53           ` Diego Calleja
2005-01-07 23:15             ` Linus Torvalds
2005-01-10 23:23         ` Robert White
2005-01-07 17:45     ` Chris Friesen
2005-01-07 16:39   ` Davide Libenzi
2005-01-07 17:09     ` Linus Torvalds
2005-08-18  6:07   ` Coywolf Qi Hunt
  -- strict thread matches above, loose matches on Subject: below --
2005-01-20  2:14 Robert White
2005-01-16  2:59 Make pipe data structure be a circular list of pages, rather Linus Torvalds
2005-01-19 21:12 ` Make pipe data structure be a circular list of pages, rather than linux
2005-01-20  2:06   ` Robert White
     [not found] <Pine.LNX.4.44.0501091946020.3620-100000@localhost.localdomain>
     [not found] ` <Pine.LNX.4.58.0501091713300.2373@ppc970.osdl.org>
     [not found]   ` <Pine.LNX.4.58.0501091830120.2373@ppc970.osdl.org>
2005-01-12 19:50     ` Davide Libenzi
2005-01-12 20:10       ` Linus Torvalds
     [not found] <200501070313.j073DCaQ009641@hera.kernel.org>
2005-01-07  3:41 ` William Lee Irwin III
2005-01-07  6:35   ` Linus Torvalds
2005-01-07  6:37     ` Linus Torvalds
2005-01-19 16:29       ` Larry McVoy
2005-01-19 17:14         ` Linus Torvalds
2005-01-19 19:01           ` Larry McVoy
2005-01-20  0:01             ` Linus Torvalds

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