Re: Waking dma cxt=2

[Mark <to...@to...>]

Yipe! Ive never tried using hdparm that way...  Looks like DMA isnt being
used.  I assume this is the problem.  I have tried turning dma on using
hdparm, but hdparm -t -T shows the same results as when DMA was
off... slowness.   Can you confirm for me that this is in fact the
problem?

Also, where can I look to make DMA used? Linux is configured ok, i have
checked that out... I don't believe that my BIOS has any settings for
DMA... I am using my on-board IDE controller, it is build into an Asus
HOT-591 motherboard.  Think i should try an off-board IDE controller?

PS: I just did hdparm -d 1 /dev/hdc and now the drive reports to be using
DMA, but the output from the read tests are just as slow, so i have to
assume that it only thinks it is using DMA.


Thanks, 

Mark


BEFORE DMA TURNED ON:
/dev/hdc:
 multcount    =  0 (off)
 I/O support  =  0 (default 16-bit)
 unmaskirq    =  0 (off)
 using_dma    =  0 (off)
 keepsettings =  0 (off)
 nowerr       =  0 (off)
 readonly     =  0 (off)
 readahead    =  8 (on)
 geometry     = 5606/255/63, sectors = 90069840, start = 0

/dev/hdc:
 Timing buffer-cache reads:   128 MB in  3.13 seconds = 40.89 MB/sec
 Timing buffered disk reads:  64 MB in 25.11 seconds =  2.55 MB/sec

AFTER DMA TURNED ON:

/dev/hdc:
 multcount    =  0 (off)
 I/O support  =  0 (default 16-bit)
 unmaskirq    =  0 (off)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 nowerr       =  0 (off)
 readonly     =  0 (off)
 readahead    =  8 (on)
 geometry     = 5606/255/63, sectors = 90069840, start = 0


/dev/hdc:
 Timing buffer-cache reads:   128 MB in  3.68 seconds = 34.78 MB/sec
 Timing buffered disk reads:  64 MB in 23.08 seconds =  2.77 MB/sec



On Wed, 6 Dec 2000, Nabil Sayegh wrote:

> Could you post the output of:
> 
> hdparm /dev/hdX
> hdparm -t -T /dev/hdX
> 
> cu
> --
>  Nabil Sayegh
>