On Tue, 20 Aug 2024, Dan Ritter wrote: > fxkl4...@protonmail.com wrote: >> i have a video capture card with 4 separate chips >> when i start up i get bttv0 - bttv3 >> i'm getting a lot of errors in syslog on bttv2 and bttv3 >> like >> bttv: 2: timeout: drop=3888442 irq=27910652/28054718, risc=338f048c, bits: >> HSYNC >> bttv: 3: timeout: drop=3940265 irq=27929862/27929862, risc=33adc01c, bits: >> HSYNC >> >> could it be related to interrupts and cpus >> cat /proc/interrupts >> CPU0 CPU1 CPU2 CPU3 >> 16: 0 26950435 0 0 IO-APIC 16-fasteoi bttv1 >> 17: 0 0 28079982 0 IO-APIC 17-fasteoi bttv2 >> 18: 0 0 27950635 0 IO-APIC 18-fasteoi i801_smbus, >> bttv3 >> 19: 66003 0 0 0 IO-APIC 19-fasteoi bttv0 >> >> i notice bttv2 and bttv3 are on the same cpu >> and bttv3 is sharing an interrupt >> is this related to my timeout errors >> if so is it correctable > > Depending on the hardware -- I don't remember the ins and outs > of most video capture cards these days -- you should be able to > set the interrupt per card either in hardware or at kernel > module load time. > > This could certainly be an issue, especially on a relatively > low-powered machine; if you don't have the irqbalance daemon > installed, you might try that first. > > -dsr- >
i installed irqbalance and it dramatically reduced the errors from 2-3 a minute to 1 every 3-4 minutes
