[linux-dvb] Re: [PATCH] fix for stream corruption on budget /Nova-T cards

[Jon Burgess <mplayer@jburgess.uklinux.net>]

Stefan Betermieux wrote:

> I will investigate the IRQ issue this evening. I am pretty sure that your 
> patch is executed half of time, because I inserted a syslog message inside 
> your if statement and in a newly created else statement another message. They 
> alternated in the log most of the time, I am just not sure about the absolute 
> IRQ/s.
You need to be a bit careful because syslog likes to sync all the kernel 
messages to disk which can cause the system to behave strangely.
Try disabling syslog and running everything from the console and see if 
that makes a difference.

printk() is still a bit slow, and probably adversely effects the timing 
of the interrupt loop. You could try implementing a couple of static 
counters and making them printk() only every 100 or so times the irq 
gets called.

Are you using the DVB or dvb-kernel drivers?


> USB 2.0 gets into my mind, but there are only USB 1.0 devices plugged in.

My card shares an IRQ with a USB device. Strangely removing the usb 
driver actually makes the corruption worse. Now I think I undertand why.

	Jon




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