Can confirm slow burning speeds (since ubuntu 8.04 to 9.10), both on my old pc:
Pentium 4 2gb ram with an IDE plextor drive
and my new:
i7 4gb ram with sata drive SONY OPTIARC AD-5240S.
Both have SWAP disabled.
In more detail, last night tried to burn an iso to a DL-DVD at x8 using
nerolinux.
The read buffer was all the time full, but the dvd recorder`s buffer dropped
all the time (to 4%).
So it seems it is not a low memory or slow file-system problem
Have also tried brasero and k3b in the past, getting the same results.
Using windows, I have been able to write dvd`s at x24 even on the
Pentium 4 machine.
hdparm -i /dev/dvd
/dev/dvd:
HDIO_DRIVE_CMD(identify) failed: Bad address
Model=Optiarc, FwRev=1.02, SerialNo=
Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
BuffType=unknown, BuffSize=0kB, MaxMultSect=0
(maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
AdvancedPM=no
Drive conforms to: Unspecified: ATA/ATAPI-3,4,5,6,7
* signifies the current active mode
--
Brasero, GNOME's burn:/// and K3b slow dvd burn speed
https://bugs.launchpad.net/bugs/31709
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