cdrecord performance
James Drabb
JDrabb at tampabay.rr.com
Sun Aug 1 20:44:11 UTC 2004
fredex wrote:
<SNIP>
> Have you looked to see if your hard drives and CD burner have DMA
> enabled? If not it MIGHT account for this sort of problem. Perhaps.
>
> Fred
Yes, my hard drive according to hdparm -Tt /dev/hda:
jim at keelie $ sudo hdparm -Tt /dev/hda
/dev/hda:
Timing buffer-cache reads: 1524 MB in 2.00 seconds = 760.22 MB/sec
Timing buffered disk reads: 170 MB in 3.03 seconds = 56.15 MB/sec
My DVDRW drive is set to UDMA 2 according to hdparm -i /dev/hdc and
shows this for hdparm -Tt /dev/hdc
jim at keelie $ sudo hdparm -Tt /dev/hdc
/dev/hdc:
Timing buffer-cache reads: 1552 MB in 2.00 seconds = 774.96 MB/sec
Timing buffered disk reads: 8 MB in 3.34 seconds = 2.40 MB/sec
Does 2.4 MB/sec sound right for a DVDRW drive?
Running hdparm /dev/hdc showed this output:
jim at keelie $ sudo hdparm /dev/hdc
/dev/hdc:
HDIO_GET_MULTCOUNT failed: Invalid argument
IO_support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 0 (off)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
HDIO_GETGEO failed: Invalid argument
So I turned on 32 bit support and DMA with:
sudo hdparm -c 1 -d 1 /dev/hdc
But running hdparm -Tt /dev/hdc agian show the same numbers:
jim at keelie $ sudo hdparm -Tt /dev/hdc
/dev/hdc:
Timing buffer-cache reads: 1536 MB in 2.00 seconds = 766.20 MB/sec
Timing buffered disk reads: 8 MB in 3.19 seconds = 2.51 MB/sec
What do you get if you put a CD in your CD or DVD drive and run hdparm
-Tt /dev/hdX?
One other note:
I am using the Desktop Kernel for Fedora Core 2 from here:
http://gdj.sourceforge.net/
I also have my cdrom drive mounted with Supermount-ng.
Holy crap BatMan! I just disabled Supermount-ng and tried a burn of an
181 MB audio file and the system is running fine!
Before with my DVDROM controlled by Supermount-ng, the max burning speed
I would get is around 12X while the DVDRW is rated at 40X for normal
CDR. Without Supermount-ng, the speed went up into the 30X+ and I had
normal system response and no jerky mouse.
So I guessed I answered my own question. Thanks for the prodding.
It is a shame since I really liked Supermount-ng, much more then automount.
Jim Drabb
--
James Drabb
Senior Programmer
Davenport, FL USA
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