Recent concurrency improvements in the AHCI driver and CAM need testing

Matthew Dillon dillon at
Sun Apr 10 08:55:44 PDT 2011

:this breaks USB (daX) disks for me. After all daX disks are initialized, it hangs after:
:da8 at umass-sim0 bus 0 target 0 lun 0
:da8: <WD Ext HDD 1021 2002> Fixed Direct Access SCSI-4 device 
:da8: Serial Number WMAVU2232228 
:da8: 40.000MB/s transfers
:da8: 1430797MB (2930272256 512 byte sectors: 255H 63S/T 182401C)

    Ok, I'm on it.  It's a degenerate condition somewhere for the case
    where the device is not NCQ.


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