On Monday 30 September 2002 12:14 pm, Tom Brinkman wrote: > > > > Your comments bring up a question... > > > > > > > > In Windows, enabling DMA for CD-ROMs (and it variants) is > > > > considered a 'no-no' and will cause problems most every time. > > > > > > really? my DVD wants DMA to work at all in winders > > > cause it is much faaaaaaaaaaaaaster > > > > I've tried to check mine a couple of times (when this topic comes > > up) and hdparm always says it's not support on my drives if I use > > /dev/scdX and if I use /dev/hdx I get input output errors. Could > > this be because I have them set up under scsi emulation? Any > > other thoughts? > > thanks, > > -s > > I believe so, but you should still be able to enable dma.
> tom# hdparm -t /dev/hdd > /dev/hdd: > Timing buffered disk reads: read() hit EOF - device too small > > (my ide cdrom, no scsi emulation) > tom# hdparm -t /dev/hdc > /dev/hdc: > Timing buffered disk reads: 64 MB in 23.96 seconds = 2.67 MB/sec > > tom# hdparm -d0 /dev/hdc (turn off dma) > /dev/hdc: > setting using_dma to 0 (off) > using_dma = 0 (off) > > tom# hdparm -t /dev/hdc > /dev/hdc: > Timing buffered disk reads: 64 MB in 32.68 seconds = 1.96 MB/sec > hdparm doesn't support testing scsi drives (only ide), I suspect > the performance increase with dma enabled is similar for scsi > emulated drives. Thanks for the info and running those tests for me. Interesting stuff. -s
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