LinuxLists.cc - [PATCH] Hack to get dvd-burning at 8x (instead of 3x) with ide-cd (2.6.11)

2005-03-23 17:55:31

Subject: [PATCH] Hack to get dvd-burning at 8x (instead of 3x) with ide-cd (2.6.11)

Hi,

I'd like to receive comments/guide-lines about a hack I made to the
2.6.11 kernel to improve DVD-burning speed (using growisofs.)

The basic idea is the 16-pages pipe between mkisofs and growisofs is
too small for DVD burning (typical 4GB of data.)

In the hack, pipe_new will simply check for, if privileges permitted,
the enviroment variable
PIPE_MAX_ORDER to see if a (much) longer pipe is requested.

This hack enable me to burn DVD at 8X (instead of 3X) on my old
P3-450MHz (with growisofs and mkisofs running at SCHED_FIFO.)

--
Linh Dang

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2005-03-26 16:13:10

by Peter Osterlund

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Subject: Re: [PATCH] Hack to get dvd-burning at 8x (instead of 3x) with ide-cd (2.6.11)

Linh Dang <[email protected]> writes:

> I'd like to receive comments/guide-lines about a hack I made to the
> 2.6.11 kernel to improve DVD-burning speed (using growisofs.)
>
> The basic idea is the 16-pages pipe between mkisofs and growisofs is
> too small for DVD burning (typical 4GB of data.)
>
> In the hack, pipe_new will simply check for, if privileges permitted,
> the enviroment variable
> PIPE_MAX_ORDER to see if a (much) longer pipe is requested.
>
> This hack enable me to burn DVD at 8X (instead of 3X) on my old
> P3-450MHz (with growisofs and mkisofs running at SCHED_FIFO.)

This problem is likely caused by limited filesystem and/or hard disk
performance, not a slow CPU. You don't need a kernel patch to get a
bigger buffer though. See:

http://article.gmane.org/gmane.comp.audio.cd-record/2253

--
Peter Osterlund - [email protected]
http://web.telia.com/~u89404340