[Bug 15884] cd-burning reduces other simultaneous IO performance

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https://bugzilla.kernel.org/show_bug.cgi?id=15884





--- Comment #8 from Robert Hancock <hancockrwd@gmail.com>  2010-05-13 02:24:17 ---
The -immed flag to wodim may improve the situation, if you can make k3b add it
to the wodim command line somehow:

       -immed Tell  wodim  to  set  the  SCSI  IMMED  flag in certain commands
              (load/eject/blank/close_track/close_session).  This can be  use-
              ful  on  broken systems with ATAPI harddisk and CD/DVD writer on
              the same bus  or  with  SCSI  systems  that  don’t  use  discon-
              nect/reconnect.   These  systems  will  freeze while blanking or
              fixating a CD/DVD or while a DVD writer is filling up a  session
              to the minimum amount (approx. 800 MB).  Setting the -immed flag
              will request the command to return immediately while the  opera-
              tion proceeds in background, making the bus usable for the other
              devices and avoiding the system freeze.  This is an experimental
              feature  which  may  work  or not, depending on the model of the
              CD/DVD writer.  A correct solution would be to set up a  correct
              cabling but there seem to be notebooks around that have been set
              up the wrong way by the manufacturer.  As it  is  impossible  to
              fix this problem in notebooks, the -immed option has been added.

              A second experimental feature of the  -immed  flag  is  to  tell
              wodim  to  try  to  wait short times while writing to the media.
              This is expected to free the IDE bus if the  CD/DVD  writer  and
              the  data  source  are  connected to the same IDE cable. In this
              case, the CD/DVD writer would otherwise usually  block  the  IDE
              bus  for  nearly all the time making it impossible to fetch data
              from the source drive. See also minbuf= and -v option.

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