[Pkg-opt-media-team] Bug#562983: dvd+rw-tools: Too slow burning DVD eating all CPU fixed by removing SUID bit.

Ivan Baldo ibaldo at adinet.com.uy
Tue Apr 5 21:26:29 UTC 2011

Package: dvd+rw-tools
Version: 7.1-6
Severity: normal

  Brasero using growisofs to burn a DVD is too slow in this computer, it writes at 100 Kib/s (not a typo), the computer becomes too unresponsive, etc.
  This is an Intel Celeron 1.1 Ghz with 256 Mib PC133 RAM.
  If when it is writing I renice the process to priority 0 (it runs with -20 by default) everything starts working nicely, the desktop becomes very responsive, the writing speed is good, etc.
  For now what I did is doing a chmod 755 /usr/bin/growisofs in my rc.local so that it cannot gain realtime priority, works like a charm.
  This is an up-to-date Squeeze system.
  So I guess the questions are:
    1. Why growisofs is SUID root and why it needs such a high priority?
    2. Could it be that it has some coding bug that in this slow computer eats too much CPU polling for something and not allowing that something to do its job since growisofs is in a busy loop using all resources because it has realtime priority?
  I have access to this computer only once a week for a brief period of time, but if there is something that you want me to try let me know.
  Thanks a lot for reading and maintaining this packages!!!

-- System Information:
Debian Release: 6.0.1
Architecture: i386 (i686)

Kernel: Linux 2.6.32-5-686 (SMP w/1 CPU core)
Locale: LANG=es_UY, LC_CTYPE=es_UY (charmap=ISO-8859-1) (ignored: LC_ALL set to es_UY)
Shell: /bin/sh linked to /bin/bash

Versions of packages dvd+rw-tools depends on:
ii  genisoimage                   9:1.1.11-1 Creates ISO-9660 CD-ROM filesystem
ii  libc6                         2.11.2-10  Embedded GNU C Library: Shared lib
ii  libgcc1                       1:4.4.5-8  GCC support library
ii  libstdc++6                    4.4.5-8    The GNU Standard C++ Library v3

dvd+rw-tools recommends no packages.

Versions of packages dvd+rw-tools suggests:
pn  cdrskin                       <none>     (no description available)

-- no debconf information

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