AIC-7895 woes.

[Mark Hoebeke]

Hi,
receiving no answer to my previous request, I did some investigations.
Here's the summary.      

My config : 
- dual Pentium II 450Mhz, Adaptec AIC-7895 Ultra SCSI Adapter
managing 2 disks (Seagate ST39173W) at ids 0 & 1 and 1 CD-ROM drive
(TOSHIBA XM-6201TA) at id 6.
- Redhat 5.2 (tests were carried out with kernels 2.0.36-0.7 and 2.0.36-3)

When using release 5.1.2 of the aic7xxx driver, I have access to all
drives but the system regularely freezes in SMP mode.

When upgrading to release 5.1.12 of the aic7xxx driver, the system
doesn't hang anymore except when trying to acces the CD-ROM drive
(scsi timeouts systematically occur).

Does anybody know how to get out of this situation (other than by
upgrading to kernel 2.2.x) ?

Thanks,

Mark.

P.S.: for completeness' sake, here's the output of /proc/scsi/aic7xxx

Adaptec AIC7xxx driver version: 5.1.12/3.2.4
Compile Options:
  TCQ Enabled By Default : Disabled
  AIC7XXX_PROC_STATS     : Disabled
  AIC7XXX_RESET_DELAY    : 15

Adapter Configuration:
           SCSI Adapter: Adaptec AIC-7895 Ultra SCSI host adapter
                           Ultra Wide Controller Channel B
    PCI MMAPed I/O Base: 0xeffff000
 Adapter SEEPROM Config: SEEPROM found and used.
      Adaptec SCSI BIOS: Enabled
                    IRQ: 11
                   SCBs: Active 0, Max Active 2,
                         Allocated 15, HW 32, Page 255
             Interrupts: 48736
      BIOS Control Word: 0x18a6
   Adapter Control Word: 0x1c5e
   Extended Translation: Enabled
Disconnect Enable Flags: 0xffff
     Ultra Enable Flags: 0x0003
 Tag Queue Enable Flags: 0x0000
Ordered Queue Tag Flags: 0x0000
Default Tag Queue Depth: 8
    Tagged Queue By Device array for aic7xxx host instance 1:
      {255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255}
    Actual queue depth per device for aic7xxx host instance 1:
      {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}

Statistics:

(scsi1:0:0:0)
  Device using Wide/Sync transfers at 40.0 MByte/sec, offset 8
  Transinfo settings: current(12/8/1), goal(12/8/1), user(12/8/1)
  Total transfers 32782 (30980 reads and 1802 writes)


(scsi1:0:1:0)
  Device using Wide/Sync transfers at 40.0 MByte/sec, offset 8
  Transinfo settings: current(12/8/1), goal(12/8/1), user(12/8/1)
  Total transfers 15873 (14163 reads and 1710 writes)


(scsi1:0:6:0)
  Device using Narrow/Async transfers.
  Transinfo settings: current(0/0/0), goal(12/8/0), user(12/8/1)
  Total transfers 0 (0 reads and 0 writes) 



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