Strange L4Linux behavior

Adam Lackorzynski adam at
Fri Mar 31 01:06:00 CEST 2006

On Fri Mar 31, 2006 at 05:38:24 +0900, Jugwan Eom wrote:
> L4Linux fails to run correctly with the SCSI and network device under
> heavy load.
> My system has a Adaptec AIC7902 SCSI adapter (one SCSI hard disk is
> connected) and a E1000 network adapter. When the two devices is used at
> the same time under heavy load (some benchmarks to SCSI disk and
> transferring files using ftp), SCSI adapter driver prints error message
> and dumps device's status. and then system is not work. Actually, this
> error doesn't happen immediately after using the two devices. It works
> during some seconds (about 10~20secs).
> I could not capture all the message by SCSI adapter driver printed on
> console because it is very fast and vast. Anyway, the message means "PCI
> interrupt error". In L4Linux, the two devices share same IRQ number.
> IMHO, this is one of the source of this behavior.
> To use SCSI in L4Linux, I use dm_phys with '--isa=0x00800000' option.
> Two different IRQ handling methods (one thread per IRQ and multiple
> IRQs) got the same result.
> Is there anyone can help me?

Just guessing but can you try to give the SCSI controller and the e1000
NIC different IRQs and see if something changes?

Adam                 adam at

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