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.
Mike.
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This archive was generated by hypermail 2b29 : Sun Jul 23 2000 - 21:00:09 EST