> I have a similar setup to yours - 80+300gb LVM filesystem, stable with one > tuner, backend locks up/crashes daily since adding a second tuner. How do > you determine if bad IRQ's are the problem and how does one go about > researching/fixing this type of thing?
"lspci -v" will list all your devices, and then you can view which IRQ's they are on and compare with the other devices in the system to see what's sharing. Also, ivtv's driver init section displays the device id's of devices sharing IRQ's with a card supported by ivtv. Again, I'm not 100% sure it's IRQ conflicts & ivtv causing the lockups, but everything points to that in my testing. Unfortunately, the system I have which habitually locks up will not allow me to rearrange the IRQ's. It forces both the onboard video card and the PVR-350 to the same IRQ, even if I try and change it. I need to test on my system that works and deliberately cause IRQ conflicts to see if it in fact locks up. We do know that the machine isn't really as hard locked as it seems, ivtv is just stuck in a deadlock sort of state. Ping flooding or hitting enter at an SSH prompt often brings the box back to temporary life. -Kenneth
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