Re: Pioneer DVR-106D issues

[Rob Bogus <rob23@tmr.com>]

Andy Polyakov wrote:

> OK, requestor has reported that readcd performs at >2-3x accompanied by
> irresonsiveness of the system. This *does* appear as lack of DMA and it
> agrees pretty well with those reports from NEC users I mentioned
> yesterday. Yes, DMA must be off (or not being used on that particular
> data flowpath), *but* I don't think it's the factor resposible for
> further <1/5x performance loss, from >2x to 0.4x that is. In other words
> lack of DMA is the *least* problem and search for limiting factor may
> *not* stop there. A.
>
>
>  
Another thing I would do is to run "vmstat 1" and see if the periods of 
bad response match a very high rate of irq or ctx. Fuzzy hardware 
indicated, but I would love for him to try a vendor kernel as well.

--
E. Robert Bogusta
 It seemed like a good idea at the time