Messages in this thread | | | From | "Petr Vandrovec" <> | Date | Mon, 7 Jan 2002 17:58:14 +0100 | Subject | Re: "APIC error on CPUx" - what does this mean? |
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On 7 Jan 02 at 13:33, Alan Cox wrote: > > whether IRQ7 happens directly when we send confirmation to 8259, > > or whether it happens due to some noise on IRQ line. > > > > AFAIK it happens only on VIA based boards, and only if (AMD) CPU is using > > APIC. > > Are you using an AMD northbridge and VIA southbridge together ?
No. It is fully-VIA motherboard (Asus A7V), VIA KT133 as a northbridge and VIA686A as a southbridge, with 1GHz Athlon. And spurious IRQ happen when either of (massive) IRQ sources (Promise UDMA, tulip-based network card, an es137x soundcard) emits interrupts.
Problem is best visible when Promise is used in PIO mode with block size=512, as in such case you can get thousands of IRQs from Promise in second, and tenths of spurious IRQ7. But even if Promise emits in average one IRQ each second (== idle system with running cron and atime updates on), I get ~10 of spurious IRQ7 during one hour.
I can get complete lspci -vvv at home, if you want. Best regards, Petr Vandrovec vandrove@vc.cvut.cz
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