Very slow umass in 6.2-RC2

Ivan Voras ivoras at
Thu Feb 15 18:17:56 UTC 2007

Alexander Shikoff wrote:

> umass0: vendor 0x1005 USB FLASH DRIVE, rev 2.00/1.00, addr 2
> da0 at umass-sim0 bus 0 target 0 lun 0
> da0: < USB FLASH DRIVE 34CH> Removable Direct Access SCSI-0 device
> da0: 40.000MB/s transfers
> da0: 3936MB (8060928 512 byte sectors: 255H 63S/T 501C)
> Writing to this device is very slooooow.
> Time taken to copy file of 1,4G is near 30 min.

1400/1800=0.77... which looks suspiciously like the rate I get while
copying over USB 1 port. What does "iostat 1" say while you're copying
the file?

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