From: Mathias Kretschmer <mathias@lemur.sytes.net>
To: linux-kernel@vger.kernel.org
Subject: IDE DVD reading & error handling
Date: Tue, 04 Mar 2003 13:20:26 -0500 [thread overview]
Message-ID: <3E64EE6A.90208@lemur.sytes.net> (raw)
Hello,
Is there a way to optimize the IDE layer to handle DVD
read errors more gracefully ?
Most used DVDs (borrowed from a local library, etc.) seem to have some
defects. Those cause the IDE layer to get stuck for quite a while,
interrupting the movie playback. It might be better to just return an
error for that sector and let the player software continue.
I wonder if it would be possible to tune the IDE layer by i.e.
reducing the number of retries and disabling the controller reset, etc.
I haven't fiddle with the below numbers, yet. Just wondering if that
could improve the situation, or if there are any other tricks that one
could play here ?
/*
* Probably not wise to fiddle with these
*/
#define ERROR_MAX 8 /* Max read/write errors per sector */
#define ERROR_RESET 3 /* Reset controller every 4th retry */
#define ERROR_RECAL 1 /* Recalibrate every 2nd retry */
Cheers,
Mathias
PS: Also which DVD ROM do people recommended in general ?
Which one seems to have a decent error correction scheme
not just a high read speed?
next reply other threads:[~2003-03-04 18:08 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-04 18:20 Mathias Kretschmer [this message]
2003-03-04 22:59 ` IDE DVD reading & error handling Alan Cox
2003-03-04 22:55 ` Mathias Kretschmer
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