Date: Mon, 27 Aug 2007 17:41:31 -0700 From: Vlad Skvortsov <vss@73rus.com> To: freebsd-usb@freebsd.org Subject: low USB tranfer rate with external IDE Message-ID: <46D36F3B.70400@73rus.com>
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Hi!
I've got FreeBSD 6-STABLE with external HDD enclosure that claims to
support USB2.0 transfer rates. It is attached via a PCI USB2.0 card. The
transfer rate I'm getting with this setup is only around 1 Mb/s:
16:20 [vss@bear] ~ > diskinfo -t da0
da0
512 # sectorsize
250059350016 # mediasize in bytes (233G)
488397168 # mediasize in sectors
30401 # Cylinders according to firmware.
255 # Heads according to firmware.
63 # Sectors according to firmware.
Seek times:
Full stroke: 250 iter in 9.134642 sec = 36.539 msec
Half stroke: 250 iter in 6.990184 sec = 27.961 msec
Quarter stroke: 500 iter in 11.123201 sec = 22.246 msec
Short forward: 400 iter in 3.346094 sec = 8.365 msec
Short backward: 400 iter in 3.451729 sec = 8.629 msec
Seq outer: 2048 iter in 12.313245 sec = 6.012 msec
Seq inner: 2048 iter in 12.321137 sec = 6.016 msec
Transfer rates:
outside: 102400 kbytes in 101.798916 sec = 1006 kbytes/sec
middle: 102400 kbytes in 101.800717 sec = 1006 kbytes/sec
inside: 102400 kbytes in 101.804236 sec = 1006 kbytes/sec
It seems to be limited by the device:
16:28 [root@bear] ~ # camcontrol inquiry da0
pass0: <Maxtor 6 L250R0 BAJ4> Fixed Direct Access SCSI-0 device
pass0: Serial Number
pass0: 1.000MB/s transfers
Here are relevant lines from the dmesg:
16:37 [vss@bear] ~ > dmesg | grep umass
umass0: Myson Century, Inc. USB Mass Storage Device, rev 2.00/b0.08, addr 2
da0 at umass-sim0 bus 0 target 0 lun 0
16:37 [vss@bear] ~ > dmesg | grep usb
usb0: <Intel 82371AB/EB (PIIX4) USB controller> on uhci0
usb0: USB revision 1.0
usb1: <VIA 83C572 USB controller> on uhci1
usb1: USB revision 1.0
usb2: <VIA 83C572 USB controller> on uhci2
usb2: USB revision 1.0
16:39 [vss@bear] ~ > dmesg | grep ^uh
uhci0: <Intel 82371AB/EB (PIIX4) USB controller> port 0x1000-0x101f irq
11 at device 4.2 on pci0
uhci0: [GIANT-LOCKED]
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhci1: <VIA 83C572 USB controller> port 0x1020-0x103f irq 10 at device
16.0 on pci0
uhci1: [GIANT-LOCKED]
uhub1: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
uhci2: <VIA 83C572 USB controller> port 0x1060-0x107f irq 11 at device
16.1 on pci0
uhci2: [GIANT-LOCKED]
uhub2: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
Any clues? Where should I look at? I'm concerned with 'USB revision 1.0'
in the output -- could that be the problem?
--
Vlad Skvortsov, vss@73rus.com, http://vss.73rus.com
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