Abysmal performance on external usb drive

Brian Candler B.Candler at pobox.com
Wed Jan 18 15:02:18 PST 2006

On Fri, Jan 13, 2006 at 12:34:38PM -0800, Dread Pirate Mal wrote:
>   I'm seeing -really- terrible performance with an external usb drive on
> my freebsd 5.4 machine. It's a matrox one-touch being attached as the only
> device on port 0 of an Intel S845W<mumble> based system. And yes, I do have
> ehci compiled in and the most current bios for the board :).

You think *that's* terrible? Here's my cheapo 128M flash MP3 player:

umass0: EM102I Mp3 Player, rev 1.10/0.12, addr 2
da0 at umass-sim0 bus 0 target 0 lun 0
da0: <EM102I Mp3 Player FLASH v1.0> Removable Direct Access SCSI-0 device 
da0: 1.000MB/s transfers
da0: 125MB (256000 512 byte sectors: 64H 32S/T 125C)

Loading it up with data using a pre-prepared filesystem image so that it
doesn't jump around the flash:

# time dd if=desertisland1.img of=/dev/da0 bs=16k
8000+0 records in
8000+0 records out
131072000 bytes transferred in 698.433774 secs (187666 bytes/sec)
      698.53 real         0.02 user         1.55 sys

That's 1.5Mbps, which isn't very impressive :-(

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