AIC-7895 I/O timeouts

[Robert Baller]

I have an Intel Dakota DK440LX motherboard with an integrated AIC-7895
chipset controller and I have a PCI AHA-3940 controller in my Debian 2.1
(2.0.36 kernel) system.

Things work for the most part, but when the disks are hit with a fairly
constant amount of disk I/O activity I start see I/O timeouts in the
system log.

The attached out.txt file has a sample of the errors that are getting
logged.

AIC-7895 Channel A (ultra wide scsi channel) no devices
AIC-7895 Channel B (narrow ultra scsi channel) three narrow disk devices

AHA-3940 has a Ricoh 6201S CD-RW drive.

I have the 5.1.11 driver in my kernel.  I have the 2.0.36 kernel
compiled with SMP support since this system has two Pentium II 333 MHZ
cpus.
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Apr  2 23:56:06 sys11 kernel: scsi : aborting command due to timeout : pid 43659, scsi1, channel 0, id 1, lun 0 Read (6) 18 9d b4 04 00  
Apr  2 23:56:06 sys11 kernel: scsi : aborting command due to timeout : pid 43660, scsi1, channel 0, id 1, lun 0 Read (6) 1e 7b 6e 0e 00  
Apr  2 23:56:06 sys11 kernel: scsi : aborting command due to timeout : pid 43661, scsi1, channel 0, id 1, lun 0 Read (6) 14 bd 7c 0c 00  
Apr  2 23:56:06 sys11 kernel: scsi : aborting command due to timeout : pid 43662, scsi1, channel 0, id 0, lun 0 Write (10) 00 00 4a 26 9d 00 00 02 00  
Apr  2 23:56:06 sys11 kernel: scsi : aborting command due to timeout : pid 43663, scsi1, channel 0, id 0, lun 0 Write (10) 00 00 4a 26 b5 00 00 02 00  
Apr  2 23:56:06 sys11 kernel: scsi : aborting command due to timeout : pid 43664, scsi1, channel 0, id 0, lun 0 Write (10) 00 00 44 3a d7 00 00 02 00  
Apr  2 23:56:07 sys11 kernel: SCSI host 1 abort (pid 43659) timed out - resetting 
Apr  2 23:56:07 sys11 kernel: SCSI bus is being reset for host 1 channel 0. 
Apr  2 23:56:10 sys11 kernel: (scsi1:0:0:0) Synchronous at 5.0 Mbyte/sec, offset 15. 
Apr  2 23:56:10 sys11 kernel: (scsi1:0:1:0) Synchronous at 5.0 Mbyte/sec, offset 15. 

Apr  3 08:20:09 sys11 kernel: scsi : aborting command due to timeout : pid 161519, scsi1, channel 0, id 1, lun 0 Write (6) 15 a8 56 02 00  
Apr  3 08:20:09 sys11 kernel: scsi : aborting command due to timeout : pid 161520, scsi1, channel 0, id 1, lun 0 Read (6) 1e 3d bc 08 00  
Apr  3 08:20:10 sys11 kernel: SCSI host 1 abort (pid 161519) timed out - resetting 
Apr  3 08:20:10 sys11 kernel: SCSI bus is being reset for host 1 channel 0. 
Apr  3 08:20:13 sys11 kernel: (scsi1:0:0:0) Synchronous at 5.0 Mbyte/sec, offset 15. 
Apr  3 08:20:13 sys11 kernel: (scsi1:0:1:0) Synchronous at 5.0 Mbyte/sec, offset 15. 
Apr  3 08:23:00 sys11 /USR/SBIN/CRON[10356]: (mail) CMD (  if [ -x /usr/sbin/exim ]; then /usr/sbin/exim -q >/dev/null 2>&1; fi) 
Apr  3 08:38:00 sys11 /USR/SBIN/CRON[10827]: (mail) CMD (  if [ -x /usr/sbin/exim ]; then /usr/sbin/exim -q >/dev/null 2>&1; fi) 
Apr  3 08:40:00 sys11 /USR/SBIN/CRON[10987]: (root) CMD (test -f /proc/modules && /sbin/rmmod -a) 
Apr  3 08:40:41 sys11 kernel: scsi : aborting command due to timeout : pid 167893, scsi1, channel 0, id 1, lun 0 Read (6) 18 67 4c 02 00  
Apr  3 08:40:41 sys11 kernel: scsi : aborting command due to timeout : pid 167894, scsi1, channel 0, id 1, lun 0 Read (6) 18 67 56 06 00  
Apr  3 08:40:41 sys11 kernel: scsi : aborting command due to timeout : pid 167895, scsi1, channel 0, id 1, lun 0 Read (6) 18 67 d2 02 00  
Apr  3 08:40:42 sys11 kernel: scsi : aborting command due to timeout : pid 167896, scsi1, channel 0, id 0, lun 0 Write (10) 00 00 40 7a e1 00 00 02 00  
Apr  3 08:40:42 sys11 kernel: scsi : aborting command due to timeout : pid 167897, scsi1, channel 0, id 0, lun 0 Write (10) 00 00 44 3b 13 00 00 02 00  
Apr  3 08:40:42 sys11 kernel: scsi : aborting command due to timeout : pid 167898, scsi1, channel 0, id 0, lun 0 Write (10) 00 00 40 7a e3 00 00 02 00  
Apr  3 08:40:43 sys11 kernel: SCSI host 1 abort (pid 167893) timed out - resetting 
Apr  3 08:40:43 sys11 kernel: SCSI bus is being reset for host 1 channel 0. 
Apr  3 08:40:46 sys11 kernel: (scsi1:0:0:0) Synchronous at 5.0 Mbyte/sec, offset 15. 
Apr  3 08:40:46 sys11 kernel: (scsi1:0:1:0) Synchronous at 5.0 Mbyte/sec, offset 15.