slow external firewire drive

[Eric Edgar <rocket@gentoo.org>]

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Hi,
  I am having trouble with an external firewire drive.  I have a texas
  instruments based card and a maxtor external enclosure.  Whenever I
  try to do anything with this disk the iowait goes through the roof and
  it can take half an hour or more to untar an 80mb file.  I am not sure
  if its something with my computer or the card or the enclosure.  Any
  help would be greatly appreciated.


hci1394: $Rev: 1313 $ Ben Collins <bcollins@debian.org>
PCI: Enabling device 0000:00:0c.0 (0014 -> 0016)
PCI: Found IRQ 11 for device 0000:00:0c.0
ohci1394: fw-host0: OHCI-1394 1.0 (PCI): IRQ=[11]  MMIO=[d9800000-d98007ff]  Max
 Packet=[2048]
sbp2: $Rev: 1306 $ Ben Collins <bcollins@debian.org>
ieee1394: sbp2: Driver forced to serialize I/O (serialize_io=1)
ieee1394: sbp2: Try serialize_io=0 for better performance


ieee1394: sbp2: Logged into SBP-2 device
ieee1394: Node 0-00:1023: Max speed [S400] - Max payload [2048]
  Vendor: Maxtor    Model: 1394 storage      Rev: v1.3
  Type:   Direct-Access-RBC                  ANSI SCSI revision: 04
SCSI device sda: 156355584 512-byte hdwr sectors (80054 MB)
sda: asking for cache data failed
sda: assuming drive cache: write through
SCSI device sda: 156355584 512-byte hdwr sectors (80054 MB)
sda: asking for cache data failed
sda: assuming drive cache: write through
 sda: sda1
Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
Attached scsi generic sg0 at scsi0, channel 0, id 0, lun 0,  type 14


hdparm -tT /dev/sda

/dev/sda:
 Timing cached reads:   644 MB in  2.01 seconds = 320.40 MB/sec
 Timing buffered disk reads:    8 MB in  3.09 seconds =   2.59 MB/sec

uname -a 
2.6.14-rc4
  
I dont seem to see any error messages ... just bad performance.

  Thanks in advance,
  Eric

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