How to turn on dma?

sniggit · Posted: Fri Sep 05, 2003 11:16 pm Post subject: How to turn on dma?

When booting with lilo, i get a box say dma on my HD is not turned on and that this could really slow down fsck.

Obviously my question is: How do i turn on DMA?

And follow up questions if anyone bothers to answer them:
What is dma and what does it do?
What is fsck and what does it do?
_________________
Let the money shine!

aja · Posted: Sat Sep 06, 2003 12:08 am Post subject:

pfft · n00b Joined: 04 Sep 2003 Posts: 22 Location: nowhere

hdparm -k 1 -d 1 /dev/hdaX

for primary master hard disc

smokecd · n00b Joined: 06 Sep 2003 Posts: 42 Location: Germany

hdparm -k 1 -d 1 /dev/hdd

/dev/hdd:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
setting keep_settings to 1 (on)
using_dma = 0 (off)
keepsettings = 1 (on)

what should i do now?

augustus · Apprentice Joined: 28 Aug 2003 Posts: 173 Location: Italy

Have you tried hdparm -k 1 -d 1 /dev/hdd as root?
If no try to give hdparm -k 1 -d 1 /dev/hdd as root.
If yes you can try to add

options ide-cd dma=1

in your

/etc/modules.conf

smokecd · n00b Joined: 06 Sep 2003 Posts: 42 Location: Germany

ok, i added it at the end of the file...and what now?

luugin · n00b Joined: 10 May 2003 Posts: 69

This should enable dma when you boot:

augustus · Apprentice Joined: 28 Aug 2003 Posts: 173 Location: Italy

smokecd · n00b Joined: 06 Sep 2003 Posts: 42 Location: Germany

augustus · Apprentice Joined: 28 Aug 2003 Posts: 173 Location: Italy

ATA/IDE/MFM/RLL support --> IDE, ATA and ATAPI Block devices --> Use pci dma by default when avaible

on kernel 2.4.21

here you should add also Generic PCI bus-master dma support

(ATA/IDE/MFM/RLL support --> IDE, ATA and ATAPI Block devices --> Generic PCI bus-master dma support)

smokecd · n00b Joined: 06 Sep 2003 Posts: 42 Location: Germany

ok, dma is enabled in bios and in the kernel but it still doesn't work.

smokecd · n00b Joined: 06 Sep 2003 Posts: 42 Location: Germany

pls help me

ank · Posted: Sun Sep 07, 2003 9:01 pm Post subject:

Which kernel you use? I have used gentoo-sources and dma is working, but iptables didnt work so i switch to grsec-sources and now iptables work but dma dont.
Now i have the same problam as you

But at least firewall is working

smokecd · n00b Joined: 06 Sep 2003 Posts: 42 Location: Germany

i have got the vanilla sources

ank · Posted: Sun Sep 07, 2003 9:45 pm Post subject:

Well grsec-sources are vanilla-sources with the grsecurity patch.

Maybe is something in vanilla-sources which turn dma off ?

smokecd · n00b Joined: 06 Sep 2003 Posts: 42 Location: Germany

dunno, my hdd works in udma6 mode

ank · Posted: Sun Sep 07, 2003 10:14 pm Post subject:

mine hdd too.

I do all what is here but still no dma

vbenares · Apprentice Joined: 13 Aug 2003 Posts: 205

It may be that his DMA is actually enabled but AFTER the "box" pops up during the boot. Could someone tell him how to check whether DMA is working after the machine has booted up?

cyrillic · Posted: Sun Sep 07, 2003 11:04 pm Post subject:

None of you guys have mentioned what IDE chipset you are using, and this is the key to getting DMA to work.

For example, on the machine I am using now :

ank · Posted: Mon Sep 08, 2003 8:17 am Post subject:

TNX cyrilic

Adding IDE chipset to kernel turns dma on

btw: i have a VIA IDE controller too

vbenares · Apprentice Joined: 13 Aug 2003 Posts: 205

Do this:

hdparm /dev/hdX

and this:

hdparm -tT /dev/hdX

and post the result

smokecd · n00b Joined: 06 Sep 2003 Posts: 42 Location: Germany

root@Smoke:/home/felix$hdparm /dev/hdd

/dev/hdd:
multcount = 16 (on)
IO_support = 1 (32-bit)
unmaskirq = 0 (off)
using_dma = 0 (off)
keepsettings = 1 (on)
readonly = 0 (off)
readahead = 8 (on)
geometry = 238216/16/63, sectors = 240121728, start = 0
root@Smoke:/home/felix$hdparm -tT /dev/hdd

/dev/hdd:
Timing buffer-cache reads: 1476 MB in 2.00 seconds = 738.00 MB/sec
Timing buffered disk reads: 20 MB in 3.04 seconds = 6.58 MB/sec

how can i find out which IDE chipset i use? i don't think that it's via, 'cause I've got a nforce2 chipset on my mainboard

ank · Posted: Mon Sep 08, 2003 2:37 pm Post subject:

Type: lspci

to find out wich ide controller you have.

My is:

root@gentoobox /home/ank # lspci
00:00.0 Host bridge: VIA Technologies, Inc. VT8366/A/7 [Apollo KT266/A/333]
00:01.0 PCI bridge: VIA Technologies, Inc. VT8366/A/7 [Apollo KT266/A/333 AGP]
00:05.0 Multimedia audio controller: C-Media Electronics Inc CM8738 (rev 10)
00:09.0 USB Controller: VIA Technologies, Inc. USB (rev 50)
00:09.1 USB Controller: VIA Technologies, Inc. USB (rev 50)
00:09.2 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 51)
00:11.0 ISA bridge: VIA Technologies, Inc. VT8233A ISA Bridge
00:11.1 IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT8233/A/C/VT8235 PIPC Bus Master IDE (rev 06)
00:11.2 USB Controller: VIA Technologies, Inc. USB (rev 23)
00:11.3 USB Controller: VIA Technologies, Inc. USB (rev 23)
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon R200 QL [Radeon 8500 LE]
root@gentoobox /home/ank #

smokecd · n00b Joined: 06 Sep 2003 Posts: 42 Location: Germany

bash: lspci: command not found

ank · Posted: Mon Sep 08, 2003 2:42 pm Post subject:

You must type this as root.