[nycbug-talk] High amount of interrupt activity when using FreeBSD CAM

[H. G.]

On 10/4/07, Peter Wright <pete at nomadlogic.org> wrote:
>
>
> > Greets folks.
> >
> > Please tolerate today's stupid question:
> > Is a high amount of interrupts "normal" when using FreeBSD's ATAPICAM?
> > Perhaps there was a kernel tunable I forgot to tweak, or a kernel option
> I
> > forgot to compile in?
> >
> > When using growisofs in FreeBSD through the CAM framework, top reports
> > almost 95% CPU time spent on just interrupts.
> > As you can imagine, the machine gets pretty lazy to stimuli when this
> > happens.
> >
> > Pointers?  Comments?  Derisive laughter?
> >
>
> hmmm - what release of FreeBSD is this?  GENERIC kernel exhibiting same
> behaviour?  hardware config?  folks'll need at least this much info to
> help out.


Apologies for forgetting to include this information:
Its FreeBSD 6.2
.  The kernel is custom built using the same config as GENERIC,
but with the "driver atapicam" option added.  Hardware is a Compaq R3000
laptop,
ATI IXP chipset with an NEC DVD-RW drive.
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