[Asterisk-Users] te410p with serial console fails with error: TE410P: Double/missed interrupt detected

[Richard Scobie]

Mark Spencer wrote:
>>I am having trouble getting the te410p to work with a serial console.  Has
>>anyone else had this problem?  Am I doing somthing wrong? Interupt
>>problem? Is this a bug?
> 
> 
> The serial console likely is blocking interrupts for too long when it
> engages.  Zaptel requires interrupts be serviced 1000 times per second,
> for an interrupt latency of < 1ms max.  Generally this is not a problem,
> but some systems in linux (e.g. IDE if DMA is enabled, Framebuffer
> console, etc) block interrupts for exceptionally long periods of time,
> thus causing this sort of problem.

[Snip...]

I guess in the case of IDE DMA, using hdparm -u1 would remove the 
interrupt blocking. DMA on IDE disks is a nice thing to have...

Richard