Copying DVD+RW contents from a DVD writer drive is very slow and consuming 100% CPU

[Jery Wang]

My CPU is P4 2.4GHz with 512MB.
DVD is LG (DVD+/-R, DVD+/-RW, DVDROM, CD-R/RW, CDROM)
Max reading speed for
DVDROM: 22160 Kbytes/s (16X)
DVD+/-RW: 8X => 11080 Kbytes/s

My observation of the copying in my PC using Ubuntu Hoary array 7, using
nautilus copy and paste is 1MB/s

[Sebastien Bacher (seb128)]

and using the command line ?

[Matt Zimmerman (mdz)]

(possibly a duplicate of bug #36185)

[Jery Wang (jery-wang2002)]

(In reply to comment #1)
> and using the command line ?

No, just using nautilus. Copy any file and Go CD/DVD creator -> Paste and Write Disc

And I found out the reason, the default configuration of /dev/hdd (the DVD
writer) was

IO_support = 0
using_dma = 0

That means it runs PIO.

I have changed it in /etc/hdparm

and now
hdparm /dev/hdd

/dev/hdd:
 IO_support = 3 (32-bit w/sync)
 unmaskirq = 1 (on)
 using_dma = 1 (on)
 keepsettings = 0 (off)
 readonly = 0 (off)
 readahead = 256 (on)
 HDIO_GETGEO failed: Invalid argument

It improve the speed a little bit but the 100% CPU is no longer there.

[Sebastien Bacher (seb128)]

(In reply to comment #3)

> No, just using nautilus. Copy any file and Go CD/DVD creator -> Paste and
Write Disc

I've asked from the command line to know if that's a nautilus issue or not.

> And I found out the reason, the default configuration of /dev/hdd (the DVD
> writer) was
>
> IO_support = 0
> using_dma = 0

That's a dma using, thanks. I'm closing this bug as a duplicate of #3672.

This bug has been marked as a duplicate of bug 36185.