> >>> "Lazy SPLs - The kernel no longer masks hardware events unless a > >>> hardware event actually occurs, avoiding many expensive > >>> operations." > >> We've been doing it for as long as I can remember, at least as far > >> back as 2.0.5, probably as far back as 1.x. > > My earliest memory of it was as "Bruce's new interrupt code" for 386bsd. > > It was part of the 386bsd patchkit I think. > > Why mask out the interrupts at all, instead of queuing them in handler > level?
Level-triggered interrupts are persistent conditions, not queueable events. They typically require device-driver level intervention to be cleared. This is a major error in the PCI design (no surprises there). -- \\ The mind's the standard \\ Mike Smith \\ of the man. \\ msm...@freebsd.org \\ -- Joseph Merrick \\ msm...@cdrom.com To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-hackers" in the body of the message
