reduce interrupt rate for CD/DVD drive(r)

Rick C. Petty rick-freebsd at
Mon Aug 28 00:11:47 UTC 2006

On Sun, Aug 27, 2006 at 04:37:29PM -0700, Jin Guojun [VFFS] wrote:
> I have difficulty to get CD/DVD write speed above 1.6MB/s  (10x for CD, 
> or 1.1x for DVD).
> The problem seems to be the interrupt rate is high (70-80% of CPU) for 
> CD/DVD drive(r).

What's the value of the "hw.ata.atapi_dma" sysctl?

-- Rick C. Petty

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