Hi Miquel,
> In article <cistron.8ko68e$j0$1@enterprise.cistron.net>,
> Miquel van Smoorenburg <miquels@cistron.nl> wrote:
> >AMI Megarum II board w/ 2xPIII/450 1 GB RAM, dual symbios onboard SCSI
> >1 9 GB system disk on scsi0, 4 18 GB spool disks on scsi1
> >Linux 2.2.17pre11
> >
> >After 5-15 minutes, the system hung. The symbios chipset stopped to
> >deliver interrupts. When I posted this to linux-scsi, Gerard Roudier
> >said that it was logical that the system wasn't stable: APIC PCI
> >interrupts have to be level triggered and not edge triggered, while
> >the output from /proc/interrupts said:
> >
> > CPU0 CPU1
> > 10: 41954 47456 IO-APIC-edge sym53c8xx
> > 15: 1684 3355 IO-APIC-edge sym53c8xx
> >
> >However, in the AMI BIOS (or the scsi bios) there is no way to adjust
> >this. The BIOS sets the interrupts to edge triggered, and that's it.
>
> I found the solution myself this weekend.
>
> It appears that the BIOS reports the interrupts as edge triggered,
> while in reality they are level triggered. So we need a way to
> override the information from the BIOS.
>
> Jos van de Ven posted such a patch on the linux-smp mailinglist
> about a year ago. Fortunately the patch still applies and solves my
> problem completely.
>
> See http://marc.theaimsgroup.com/?l=linux-smp&m=93143486926833&w=2
> for Jos' posting and the patch.
Cool. :-) But what is (the difference between) edge triggered and level
triggered? I searched on the Internet, but couldn't find it.. Please
enlighten me :-)
Ookhoi
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