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

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Date:	Mon, 26 May 2008 16:15:41 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Fausto Richetti Blanco <fausto.blanco@...il.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	jens.axboe@...cle.com
Subject: Re: Pipe buffers' limit of 16 * 4K

On Saturday 2008-05-24 02:19, Fausto Richetti Blanco wrote:
>
>       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) ?

Jens had patches to adjust the pipe buffer sizes dynamically via an 
ioctl, perhaps these should really be pushed? I also had interest in 
having these in the kernel for toying with minibuffer audio processing.

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