On 27/11/05, Mark Knecht <markknecht@xxxxxxxxx> wrote: > On 11/27/05, Pete Leigh <pete.leigh@xxxxxxxxx> wrote: > > Didn't Clemens Ladisch write a (now outdated) patch to re-assign > > APIC priorities in software, and a program to change PIC interrupt > > priorities? > For APIC - yes > For PIC - no Oh, perhaps I misread at http://users.informaik.uni-halle.de/~ladischc/pic_priorities.html where he says: (quote on) To configure the PIC, use the following little program: set8259priorities.c (source code only). [...] The above example configuration with interrupt 5 at the top can be set with "set8259priorities 5 8". For interrupt 11 at the top, run "set8259priorities 2 11". (quote off) Or perhaps I didn't understand what he was saying. It seems to be saying that the PIC controller can be programmed to some extent from software, at least in principle (perhaps it needs some hardware support?) > > Is the latter an intrinsically inferior solution? > I didn't follow. Sorry. I meant to ask: is using the irq handling thread priority control from the rt kernel patches necessarily a worse way to go about things than hardware re-prioritisation? Cheers, - Pete.
