Holger, On Thu, 8 Nov 2018, Holger Schurig wrote: > > Yet another thing which would be interesting. Load the i915 module and run > > the userland graphics stack. Open the serial port for read, which should > > not result in any interrupts. Check /proc/interrupts for the number of > > interrupts for the serial port, > > Hmm, the 8250 driver will generate one interrupt even when just reading. the one is ok. That's an initial TX empty or state change. Nothing to worry about. > > wait 10 seconds and check again. In theory the numbers should be the > > same. My crystal ball tells me they are not. > What I'm wondering is about the massive number of ERR interrupts ... > > root@test:~# while sleep 1; do grep ERR: /proc/interrupts ; done > ERR: 25786 > ERR: 25809 > ERR: 25837 > ERR: 25861 > ERR: 25890 > ERR: 25912 > ^C > > This is specific to nolapic=1, with "noapic=1" the ERR interrupt number > stays at 51. But I guess this is a red herring, too, because who runs > his box with nolapic=1 in the first place :-) Could you do the same test without nolapic please? Thanks, tglx
