linux-kernel - Pipe buffers' limit of 16 * 4K

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Message-ID: <d8d698ae0805231719g4202edf2k947bba4128385ab6@mail.gmail.com>
Date:	Fri, 23 May 2008 21:19:13 -0300
From:	"Fausto Richetti Blanco" <fausto.blanco@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Pipe buffers' limit of 16 * 4K

Hello guys,

       I'm working with a 2.6.9 kernel (ok, I know it's quite old) and
faced a problem with the 4K (one page) buffer limit for the pipes.
I've found that in the 2.6.11 the pipes' buffers were changed to a
circular list of pages which increased this limit to 16 * 4K. This
limit is hardcoded here /usr/src/linux/include/linux/pipe_fs_i.h:6
#define PIPE_BUFFERS (16)

       Is there a reason for this not to be an adjustable parameter
(eg.: by an ulimit in the userspace) ?

       Can you please CC me on the answer ?

       Thanks in advance,

            Fausto Richetti Blanco
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