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?
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
