Re: missing interrupts (was Re: CURRENT is freezing again ...)
On Mon, 27 Nov 2000, Andrew Gallatin wrote: Bruce Evans writes: Possible causes of the problem: 1) isa_handle_intr() claims to send specific EOIs (0x30 | irq) but actually sends non-specific ones (0x20 | garbage). Since interrupts I think that sending non-specific EOIs is the problem. Sending specific EOIs seem to eliminate my nic timeouts and the need to manually feed an eoi to recover from a missing interrupt. My question is: how does one send a specific EOI correctly? I don't have decent documentation for this. Above, you seem to imply that 0x30 is a specific EOI. That does not seem to work for me (machine locks at boot). Linux uses 0xe0. According to some Tru64 docs I have, that means "Rotate Priority on specific EOI". According to that same documentation, 0x60 is a specific EOI. Both of these Oops, I misread the data sheet. 0x60 is correct, 0x30 is wrong. The irq number is in the lowest 3 bits. appear to work just fine. What should the alpha port use? I think it should use non-specific EOIs and send them early (when there is no ambiguity about which interrupt is being handled), as in the i386 port. Sending them late mainly gives the ICU's braindamaged interrupt priority scheme for longer than necessary. Bruce To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
Re: missing interrupts (was Re: CURRENT is freezing again ...)
In [EMAIL PROTECTED], Andrew Gallatin wrote: Bruce Evans writes: Possible causes of the problem: 1) isa_handle_intr() claims to send specific EOIs (0x30 | irq) but actually sends non-specific ones (0x20 | garbage). Since interrupts may be handled in non-LIFO order, this results in EOIs being sent for the wrong interrupts. I think this just randomizes the brokenness caused by delaying sending of EOIs. I can't see how it would result in an EOI being lost -- the right number of EOIs will have been sent after all handlers have returned. I think that sending non-specific EOIs is the problem. Sending specific EOIs seem to eliminate my nic timeouts and the need to manually feed an eoi to recover from a missing interrupt. My question is: how does one send a specific EOI correctly? I don't have decent documentation for this. Above, you seem to imply that 0x30 is a specific EOI. That does not seem to work for me (machine locks at boot). Linux uses 0xe0. According to some Tru64 docs I have, that means "Rotate Priority on specific EOI". According to that same documentation, 0x60 is a specific EOI. Both of these appear to work just fine. What should the alpha port use? My notes say: Non-specific EOI : 0x20 Specific EOI : 0x60 | IRQn EOI + rotate priority: 0xa0 EOI + select lowest priority : 0xe0 | IRQn -- Robert S. F. Drehmel [EMAIL PROTECTED] To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
Re: missing interrupts (was Re: CURRENT is freezing again ...)
Bruce Evans writes: Possible causes of the problem: 1) isa_handle_intr() claims to send specific EOIs (0x30 | irq) but actually sends non-specific ones (0x20 | garbage). Since interrupts may be handled in non-LIFO order, this results in EOIs being sent for the wrong interrupts. I think this just randomizes the brokenness caused by delaying sending of EOIs. I can't see how it would result in an EOI being lost -- the right number of EOIs will have been sent after all handlers have returned. I think that sending non-specific EOIs is the problem. Sending specific EOIs seem to eliminate my nic timeouts and the need to manually feed an eoi to recover from a missing interrupt. My question is: how does one send a specific EOI correctly? I don't have decent documentation for this. Above, you seem to imply that 0x30 is a specific EOI. That does not seem to work for me (machine locks at boot). Linux uses 0xe0. According to some Tru64 docs I have, that means "Rotate Priority on specific EOI". According to that same documentation, 0x60 is a specific EOI. Both of these appear to work just fine. What should the alpha port use? Thanks, Drew To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
