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List:       packet-writing
Subject:    Re: packet-writing and dvd+rw patch
From:       Roy Bamford <zenadsl6108 () zen ! co ! uk>
Date:       2003-08-01 22:20:03
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On 2003.08.01 22:35, Volker Kuhlmann wrote:
> Thanks Roy for the hints - at 02:00 I had called it a day.
> 
> I prefer to stay with the SuSE 8.2 kernel to deviate as little as
> possible, but it might be worth making the gentoo patch fit.
> 
> > to a DVD-RW.  Perhaps is this dvd packet writing patch for DVD-RW?
> 
> I'd be interested in more experiences with both the packet writing and
> the dvd+rw patch (those people should talk to each other... :) ).
> 
> Thanks,
> 
> Volker
> 
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> 
Volker,

There is a problem writing large files (aprox = to phyisical mem) onto 
DVD+RW or with pktcdvd in the 2.4 series kernel. The hdd can move data 
to memory much faster than it can be written to the CD/DVD. As a 
result, physical memory gets full of dirty disc buffers waiting to be 
written. Then, any task that tries to allocate memory just gets put to 
sleep - including X.
The system acts like its just died. Dirty buffers cannot be written to 
swap (think about it).  I have heard that this is being addressed in 
the 2.6 kernel but I haven't tried it yet.

Don't be too keen to stick with a 2.4 kernel

Regards,

Roy Bamford



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