Re: Re: DVD writing speed (1x!) on a Samsung TS-H552U
> > Mounted Media: 1Bh, DVD+R
> > Current Write Speed: 8.0x1385=11080KB/s
> > Write Speed #0: 8.0x1385=11080KB/s
>
> > growisofs stdout: 38010880/1988837376 ( 1.9%) @0.0x, remaining 36:46
> > growisofs stdout: 38436864/1988837376 ( 1.9%) @0.1x, remaining 38:54
> > growisofs stdout: 41549824/1988837376 ( 2.1%) @0.7x, remaining 39:03
> >
> > It continues varying between @0.7 and @1.2 through the entire disk record
> In my experience there are 2 possibilities for this: DMA is not enabled
> for the burner (hdparnm /dev/hdX to check)
DMA is definitely turned on:
$ hdparm /dev/hdc ~
/dev/hdc:
IO_support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
HDIO_GETGEO failed: Invalid argument
> , or a bug in the Linux kernel
> causes a waste of 90% CPU time with disk accesses. The bug is triggered
> by heavy disk activity. Newer kernels (SuSE at least) have some sort of
> auto-recover in it, otherwise a reboot is the only fix. This bug
> typically occurs with newer+faster disks on older IDE hardware.
I'm not quite sure what you mean here, when I wrote the disk, my cpu was
basically idle, I certainly wasn't seeing 90% CPU usage. Is there
anything I should look at when writing a dvd to see if what you refer to
is affecting me (btw, I am using a SATA disk using a sata controller
card on an nforce board).
Crispin
P.S. please CC me in replies, I'm not subscribed to the list.
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