From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 15884] cd-burning reduces other simultaneous IO performance
Date: Thu, 13 May 2010 02:24:23 GMT
Message-ID: <201005130224.o4D2ONER002123@demeter.kernel.org>
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https://bugzilla.kernel.org/show_bug.cgi?id=3D15884
--- Comment #8 from Robert Hancock 2010-05-13 0=
2:24:17 ---
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 c=
ommands
(load/eject/blank/close_track/close_session). This can b=
e use-
ful on broken systems with ATAPI harddisk and CD/DVD wr=
iter on
the same bus or with SCSI systems that don=E2=80=99=
t use discon-
nect/reconnect. These systems will freeze while blan=
king or
fixating a CD/DVD or while a DVD writer is filling up a =
session
to the minimum amount (approx. 800 MB). Setting the -imm=
ed flag
will request the command to return immediately while the =
opera-
tion proceeds in background, making the bus usable for th=
e other
devices and avoiding the system freeze. This is an exper=
imental
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 b=
een set
up the wrong way by the manufacturer. As it is impossi=
ble to
fix this problem in notebooks, the -immed option has been=
added.
A second experimental feature of the -immed flag is t=
o 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 writ=
er and
the data source are connected to the same IDE cable. =
In this
case, the CD/DVD writer would otherwise usually block t=
he IDE
bus for nearly all the time making it impossible to fet=
ch data
from the source drive. See also minbuf=3D and -v option.
--=20
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