Date: Mon, 17 Jul 2006 15:22:25 +0100 From: Alex Zbyslaw <xfb52@dial.pipex.com> To: freebsd-hackers@freebsd.org Subject: [Fwd: Interrupts question] Message-ID: <44BB9D21.3010400@dial.pipex.com>
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No responses from questions@. Anyone here understand what's going on? Thanks]. __ I was monitoring a machine with "systat -vmstat" and noticed something about the interrupts and I don't know if it's a problem or not. If it is a problem, is there anything I can do about it? The interrupts for the network interface (em0) on irq 64 exactly match those for a uhc device on irq 16. And the interrupts for the hardware raid (amr) on irq 46 exactly match those for a uhc device on irq 18. The machine is a Dell 2850 running 5.4. Relevant bits from the dmesg are: ioapic0: Changing APIC ID to 2 ioapic1: Changing APIC ID to 3 ioapic1: WARNING: intbase 32 != expected base 24 ioapic2: Changing APIC ID to 4 ioapic2: WARNING: intbase 64 != expected base 56 ioapic3: Changing APIC ID to 5 ioapic3: WARNING: intbase 96 != expected base 88 ioapic0 <Version 2.0> irqs 0-23 on motherboard ioapic1 <Version 2.0> irqs 32-55 on motherboard ioapic2 <Version 2.0> irqs 64-87 on motherboard ioapic3 <Version 2.0> irqs 96-119 on motherboard [...] amr0: <LSILogic MegaRAID 1.51> mem 0xdfdc0000-0xdfdfffff,0xd80f0000-0xd80fffff irq 46 at device 14.0 on pci2 [...] em0: <Intel(R) PRO/1000 Network Connection, Version - 1.7.35> port 0xecc0-0xecff mem 0xdfae0000-0xdfafffff irq 64 at device 7.0 on pci6 [...] uhci0: <Intel 82801EB (ICH5) USB controller USB-A> port 0xace0-0xacff irq 16 at device 29.0 on pci0 [...] uhci2: <Intel 82801EB (ICH5) USB controller USB-C> port 0xaca0-0xacbf irq 18 at device 29.2 on pci0 [...] Turning off USB isn't an option as it's required for the pseudo-keyboard/mouse used by the DRAC. Here a sample of the interrupt section. The number of interrupts for em0@64/uhc@16 can easily be in the thousands rather than hundreds. Interrupts 1950 total 6: fdc0 128 8: rtc 13: npx 14: ata 450 16: uhc 409 18: uhc 19: uhc 23: ata 409 46: amr 450 64: em0 4 65: em1 106: ah 107: ah Any insight appreciated, --Alex
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