Overflow/Underflow/Kaboom

[Matthew G Newcomb]

G'day,
    I have an adaptec 2940A.  It's not exactly a stable device as of
yet.  I am getting a little desperate, so...  anyone who knows how to
fix this and tells me will be sent a postcard from the South Pole.  (I
kid you not, I am going there in a month with the NSF).  Attached to it
in an external case are the following:

Attached devices: 
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: SONY     Model: SDT-9000         Rev: 0123
  Type:   Sequential-Access                ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 02 Lun: 00
  Vendor: QUANTUM  Model: FIREBALL ST3.2S  Rev: 0F0C
  Type:   Direct-Access                    ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 03 Lun: 00
  Vendor: YAMAHA   Model: CDR400t          Rev: 1.0d
  Type:   CD-ROM                           ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 04 Lun: 00
  Vendor: QUANTUM  Model: FIREBALL ST3.2S  Rev: 0F0C
  Type:   Direct-Access                    ANSI SCSI revision: 02

Everything seems to be working peachily, but one in a while this comes along:

aic7xxx: possible overflow at loop 3:8
aic7xxx: possible overflow at loop 4:8

and then:

(scsi0:4:0) Underflow - Wanted at least 45056, got 0, residual SG count 26.
(scsi0:2:0) Underflow - Wanted at least 21504, got 13312, residual SG count 3.

and one in a while these:

(scsi0:-1:0) Reset device, active_scb 2
 scsi0: (targ -1/chan A) matching scb to (targ 3/chan A)
 scsi0: (targ -1/chan A) matching scb to (targ 4/chan A)
 scsi0: (targ -1/chan A) matching scb to (targ 4/chan A)
 scsi0: (targ -1/chan A) matching scb to (targ 3/chan A)
 scsi0: (targ -1/chan A) matching scb to (targ 4/chan A)
 scsi0: (targ -1/chan A) matching scb to (targ 3/chan A)

Here's /proc/scsi/aic7xxx0:
Adaptec AIC7xxx driver version: 4.1/3.2
Compile Options:
  AIC7XXX_RESET_DELAY    : 15
  AIC7XXX_TAGGED_QUEUEING: Enabled
  AIC7XXX_PAGE_ENABLE    : Enabled
  AIC7XXX_PROC_STATS     : Enabled

Adapter Configuration:
          SCSI Adapter: Adaptec AHA-2940A Ultra SCSI host adapter
                        (AIC-786x chipset)
              Host Bus: Single
               Base IO: 0xee00
        Base IO Memory: 0xfebff000
                   IRQ: 9
                  SCBs: Used 8, HW 3, Page 8
            Interrupts: 36387
         Serial EEPROM: True
  Extended Translation: Enabled
        SCSI Bus Reset: Enabled
            Ultra SCSI: Disabled
     Target Disconnect: Enabled


I am currently running 2.1.55 (after trying 2.0.30 on up...)  Are there
any kernel configuration options that effect the stability of this
driver?  If so, could someone please post them, so I can get some more
stability out of this..

                                                                Matt

				*In the future*
Chickens will run on gasoline and many of them will get surprisingly good
gas milage - George Carlin




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				*In the future*
Chickens will run on gasoline and many of them will get surprisingly good
gas milage - George Carlin