Slow usb/umass CompactFlash reader

[Mark Knight]

I've just updated to a snapshot of 4.9-PRERELEASE.  The usb/umass 
support seems *much* more stable than I found it with 4.8.  My Oracom 
USB MP3 player now works without errors, and achieves up to 400KB/sec 
throughput.

However, if I connect my Belkin CompactFlash reader instead, that's 
very, very slow indeed.  The greatest data rate I see is about 4KB/sec, 
although no errors are reports.  Needless to say, this works much faster 
under Windows :(

Any suggestions gratefully received:

mkn at shrewd$ sudo camcontrol inquiry da0
pass0: <OEI-USB CompactFlash 5.00> Removable Direct Access SCSI-0 device
pass0: Serial Number
pass0: 650KB/s transfers
mkn at shrewd$ sudo usbdevs -v
Controller /dev/usb0:
addr 1: self powered, config 1, UHCI root hub(0x0000), Intel(0x0000), rev 1.00
  port 1 addr 2: self powered, config 1, USB2.0 Hub Controller(0x0224), NEC Corporation(0x050d), rev 1.00
   port 1 powered
   port 2 addr 3: self powered, config 1, DeskJet 970C(0x1004), Hewlett-Packard(0x03f0), rev 1.00
   port 3 powered
   port 4 addr 5: power 100 mA, config 1, USB CompactFlash(0xb000),  (0x55aa), rev 5.00
  port 2 addr 4: low speed, power 98 mA, config 1, USB-PS/2 Optical Mouse(0xc00e), Logitech(0x046d), rev 11.00

Many thanks,
-- 
Mark A. R. Knight                               finger: markk at knigma.org
Tel: +44 7973 410732                            http://www.knigma.org/