Date: Tue, 1 Mar 2005 19:13:11 -0800 (PST) From: Doug White <dwhite@gumbysoft.com> To: Peter Jeremy <PeterJeremy@optushome.com.au> Cc: freebsd-stable@freebsd.org Subject: Re: Duplicated hardware interrupts Message-ID: <20050301191033.T72408@carver.gumbysoft.com> In-Reply-To: <20050301101136.GB28962@cirb503493.alcatel.com.au> References: <20050301101136.GB28962@cirb503493.alcatel.com.au>
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On Tue, 1 Mar 2005, Peter Jeremy wrote: > Whilst tracking down some interrupt latency problems, I've found that > I'm getting duplicate interrupts from some, but not all, devices. The > double interrupts appear to always occur for some IRQs and never occur > on others. Based on those symptoms, I wonder if there's a hardware > issue. That sounds like interrupt routing problems. If you're running UP, try running this in loader before booting: set hint.apic.0.disabled=1 If things improve then your I/O APIC or routing information is bad, which isn't unusual for UP systems. Remove "device apic" from your kernel or add the hint to device.hints or loader.conf. I need this on my KT400 at home. > > The system is a GigaByte GA-7VRX-P motherboard (VIA KT333) with an > Athlon XP-1800 running 5.3-RELEASE-p5 with APIC and ACPI: > CPU: AMD Athlon(tm) XP 1800+ (1533.40-MHz 686-class CPU) > Origin = "AuthenticAMD" Id = 0x662 Stepping = 2 > Features=0x383fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE> > AMD Features=0xc0480000<MP,AMIE,DSP,3DNow!> > real memory = 536805376 (511 MB) > avail memory = 515629056 (491 MB) > ACPI APIC Table: <AMIINT AMIINI09> > ioapic0 <Version 0.2> irqs 0-23 on motherboard > ... > acpi0: <AMIINT AMIINI09> on motherboard > > I'm not seeing duplicate interrupts on atkbd0, rtc, fdc0, psm0 and ata0. > > I am seeing duplicate interrupts on drm0, rl0 and my video capture card. > > FWIW, the kernel code I'm using to check the interrupts is attached. > Userland just mmap's the buffer, converts it to ASCII and dumps it to > disk for later processing. > > Has anyone else seen anything like this? > -- Doug White | FreeBSD: The Power to Serve dwhite@gumbysoft.com | www.FreeBSD.org
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