[SATLUG] I/O Questions

[Caleb Wylie]

For some strange reason I just lost DMA on my FC1  box.  All I had to
do was download the latest and greatest of the 2.4 kernel series and
compile away.  Once I boot on the new kernel again I had DMA and it
was nice as my system was acting just like yours all sluggish when it
took a hit by a disk intensive action.

Caleb

On 7/22/05, Ed Coates <edcoates at gmail.com> wrote:
> On 7/22/05, Eli <eli at then7.com> wrote:
> > Strange.  It sure seems like the cpu is taking a beating during ordinary
> > disk usage.
> >
> > I use this to get some relative numbers for i/o:
> >
> > http://sourceforge.net/projects/tiobench/
> >
> > It executes multiple simultaneous reads/writes and gives a nice little
> > report at the end. Perhaps it will create a picture of what's going on
> > with cpu usage & i/o.
> >
> > I'm thinking that you're not really getting dma transfers.
> >
> > ~e
> Eli,
> 
> I think that you might be right about not using DMA.  When I try and
> change it from the command line, I get an error about permission
> denied, even when I'm root.  I've got the output from tiobench.pl and
> hdparm -iI -d1 /dev/hda here:
> 
> http://nighthawk.dyndns.org:81/tiobench.txt
> http://nighthawk.dyndns.org:81/hdparm.txt
> 
> If you could take a look at those, and let me know what you think.
> And any ideas on how to turn DMA on.
> 
> Ed
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