tagged command queueing?

[Eric NOULARD]

	I have 2 related questions:

1) What is exactly tagged command queueing?
   I have a 2940UW and IBM DCAS34330 (UW) should they
   support this feature? And how to enable it with
   aic7xxx driver?

   I run Linux 2.0.35 (SuSE 5.3)  with  my recompiled
   2.0.35 kernel.

2) What does those messages significate:

>>
Oct 16 15:04:06 sunway unix: WARNING: /iommu at 0,10000000/sbus at 0,10001000/espdma at 5,840
0000/esp at 5,8800000 (esp0):
Oct 16 15:04:06 sunway unix:    Disconnected tagged cmds (8) timeout for Ta
Oct 16 15:04:07 sunway unix: rget 2.0
Oct 16 15:04:07 sunway unix: WARNING: /iommu at 0,10000000/sbus at 0,10001000/espdma at 5,840
0000/esp at 5,8800000/sd at 2,0 (sd2):
Oct 16 15:04:07 sunway unix:    SCSI transport failed: reason 'timeou
Oct 16 15:04:07 sunway unix: t': retrying command
Oct 16 15:04:07 sunway unix: WARNING: /iommu at 0,10000000/sbus at 0,10001000/espdma at 5,840
0000/esp at 5,8800000/sd at 2,0 (sd2):
Oct 16 15:04:07 sunway unix:    SCSI transport failed: reason 'reset'
Oct 16 15:04:07 sunway unix: : retrying command
>>

	This does not occur on Linux but on a SUN workstation which is
my NFS server, I know this list only talks about aic7xxx but the SUN
workstation have a 2940 too so ... Just forget my second question if it
must be.

	Thanks in advance
        Eric NOULARD

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