Extreamly Slow Disk I/O with 3.8.1

**stubert** · 04-19-2005, 01:48 AM

I have tested and confirmed on three different systems (P3, P4, and VIA) that accessing a IDE HD is painfully slow when using dd, fdisk, mke2fs, etc... I have also found that when a ext3 file system is mounted, disk access is poor and may show as read-only under certain conditions.

Can someone please advise on this or point me to where I should file this as a bug report?

Thanks in advance,

Stu Sheldon
ACT USA

**chris-harry** · 04-19-2005, 11:41 AM

is it hard drived installed???

because i havent found that (me use 3.2)...

**UnderScore** · 04-19-2005, 02:59 PM

You need to enable DMA which was enabled by default in Knoppix 3.4 through 3.7 and has been disabled in 3.8.x. At the knoppix boot prompt type:
knoppix dma

If that fails to work, at a command line for hard drives:
hdparm -A 1 -c 1 -d 1 /dev/hda

For CDROM/DVD/CDRW drives:
hdparm -c 1 -d 1 /dev/hda

**stubert** · 04-19-2005, 04:06 PM

Originally Posted by UnderScore

You need to enable DMA which was enabled by default in Knoppix 3.4 through 3.7 and has been disabled in 3.8.x. At the knoppix boot prompt type:
knoppix dma

If that fails to work, at a command line for hard drives:
hdparm -A 1 -c 1 -d 1 /dev/hda

For CDROM/DVD/CDRW drives:
hdparm -c 1 -d 1 /dev/hda

And this was done why? Is there some issue I should be aware of that caused the default to change?

Stu