[PLUG] Why is it slower on a P4?

[Cooper Stevenson]

Russ,

Thanks for the hard numers!

It looks to me the same as it does to you... everything checks out,
except, of course, the responsiveness of the machine. and found this:

I looked at the UDMA mini-howto and found this
(http://leuksman.com/linux/Ultra-DMA-8.html):

  ``Normally, a UDMA-aware kernel will automatically enable UDMA support
for drives and interfaces that support it. In most cases that it
doesn't, the kernel either doesn't know how to drive your IDE chipset
(get yourself a patch, see above) or doesn't believe it is safe to
enable it (meaning you shouldn't!).''

When one follows the link to the patch, I get this for hdparam:

``UDMA support is provided for at least the following chipsets, and
probably many more I don't know about:''

  All Intel chipsets: FX, HX, VX, TX, LX
  All SiS chipsets (only SiS5598 tested, but this entire family of 

At this point a caviet: This documentation may be a bit dated. 

I then went out to look at what your motherboard chipset might be.
ExtremeTech tells me that if it's a Dell Dimention then it probably has
an Intel 845E chipset.

Off to http://groups.google.com to search for `Linux UDMA 845E.'

Bingo!

There's a patch for this. Also, there's tons of information about
hdparam in regard to the Intel chipsets!

Best,


Cooper


On Tue, 2002-11-19 at 11:57, Russ Johnson wrote:
> * Cooper Stevenson <cooper at linux-enterprise.net> [2002-11-19 11:25]:
> > Does your machine have adequate swap space available?
> > 
> > How much memeory does your machine have, and how much swap space are you
> > using?
> 
> Top output:
> 
>  11:47am  up 5 min,  1 user,  load average: 0.01, 0.12, 0.08
>  61 processes: 60 sleeping, 1 running, 0 zombie, 0 stopped
>  CPU states:  0.0% user,  0.2% system,  0.0% nice, 99.8% idle
>  Mem:  1032932K av,  105784K used,  927148K free,       0K shrd, 10272K buff
>  Swap:  248968K av,       0K used,  248968K free 37212K cached
>  
> Top output whil burning a CD:
> 
>  11:51am  up 9 min,  1 user,  load average: 1.25, 0.40, 0.18
>  69 processes: 68 sleeping, 1 running, 0 zombie, 0 stopped
>  CPU states:  7.7% user,  7.1% system,  0.0% nice, 85.0% idle
>  Mem:  1032932K av,  283892K used,  749040K free,       0K shrd, 11012K buff
>  Swap:  248968K av,       0K used,  248968K free 203416K cached
>   
> I'm also running vmware with Win2k running in it, but that ran REALLY
> nice on my PIII 800... 
> 
> It appears that adding "idebus=100" to lilo.conf in the append line has
> helped somewhat, but I'm still unable to set UDMA or DMA mode to on with
> hdparm. It returns, "not implimented" when I try.
> 
> --
> Russ Johnson
> Stargate Online
> http://www.dimstar.net
> 
> Love is the triumph of imagination over intelligence -- Murphy's Laws on Sex n°36
> 
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