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List: debian-user
Subject: CD-Burner/DVD Drive Optimization
From: Tyler Hepworth <TylerH () natr ! com>
Date: 2003-12-03 4:37:09
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I am trying to optimize my ide cd and ide dvd drives. They are initialized
as scsi emulated devices during bootup which I have found is necessary or
else they will not work, but because the dvd is placed in this mode, it
takes a huge performance hit when playing back dvd video. I found that the
dvd was not using dma.
To correct the dvd I enabled:
hdparm -d1 /dev/hdd
I have also noticed that my cd burner is not using dma mode when I run an
hdparm -i on it. Will the burner experience a similar kind of performance
hit that the dvd drive had if dma is not enabled via hdparm? Or will
enabling dma cause problems with the scsi emulation?
When I do a 'dmesg | grep hdc' I see that the cd burner is using bm-dma.
What is bm-dma? Does that replace setting dma via hdparm?
Thanks,
Tyler
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<DIV><!--StartFragment --> <FONT face=Verdana><FONT size=2>I am trying to
optimize my ide cd and ide dvd drives. They are initialized as scsi emulated
devices during bootup which I have found is necessary or else they will not
work, but because the dvd i<SPAN class=369073104-03122003>s</SPAN> placed in
this mode, it takes a huge performance hit when playing back dvd video.<SPAN
class=369073104-03122003> I found that the dvd was not using
dma.</SPAN> <BR><BR>To correct the dvd I enabled:<BR><BR>hdparm -d1
/dev/hdd<BR><BR><BR>I have also noticed that my cd burner is not using dma mode
when I run an hdparm -i on it<SPAN class=369073104-03122003>. Will the
burner experience a similar kind of performance hit that the dvd drive had if
dma is not enabled via hdparm? Or will enabling dma cause problems with
the scsi emulation?</SPAN><BR><BR><SPAN class=369073104-03122003>When I do a
'dmesg | grep hdc' I see that the cd burner is using bm-dma. </SPAN>What
is bm-dma?<SPAN class=369073104-03122003> Does that replace setting dma
via hdparm?</SPAN></FONT></FONT></DIV>
<DIV><FONT face=Verdana><FONT size=2><SPAN
class=369073104-03122003></SPAN></FONT></FONT> </DIV>
<DIV><FONT face=Verdana><FONT size=2><SPAN
class=369073104-03122003>Thanks,</SPAN></FONT></FONT></DIV>
<DIV><FONT face=Verdana><FONT size=2><SPAN
class=369073104-03122003></SPAN></FONT></FONT> </DIV>
<DIV><FONT face=Verdana><FONT size=2><SPAN
class=369073104-03122003>Tyler</SPAN></FONT></FONT></DIV></BODY></HTML>
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