Arch Linux

Cotton

Member

From: Cornwall, UK

Registered: 2004-09-17

Posts: 568

Slow USB

Can someone explain what I need to do to get my high speed USB stick recognised as USB2?

I've installed Arch to it using ext2, but despite it being specified as 30 Mb/s read & 7 Mb/s write, hdparm -tT /dev/sdb shows transfer speeds of 1 MB/s.
This is on a SIS chipset based motherboard.  The USB devices section of Hardinfo shows 2 OHCI controllers, but switching the stick to the alternative port does not improve things. I've modprobed ehci & uhci drivers to no effect.  The stick functions at the correct speed on another PC, so I know its working.

The other oddity is that a USB based copy of Backtrack3 (another distro) works at USB2 speeds on the SIS PC.  Although that appears to be using PATA drivers rather than Arch's default SATA.

Any ideas?

.:B:.

Forum Fellow

Registered: 2006-11-26

Posts: 5,819

Website

Re: Slow USB

Check dmesg output for relevant info?

---

Got Leenucks? :: Arch: Power in simplicity :: Get Counted! Registered Linux User #392717 :: Blog thingy

R00KIE

Forum Fellow

From: Between a computer and a chair

Registered: 2008-09-14

Posts: 4,734

Re: Slow USB

As far as I know EHCI drivers must be loaded first, and for me they always do, I've seen other threads where this problem was somewhat discussed but I don't remember how to force EHCI to load first, do a search and see if you can find anything similar to your problem.
Also I guess that someone that had a similar problem will eventually give you some directions on how to solve that problem.

---

R00KIE
Tm90aGluZyB0byBzZWUgaGVyZSwgbW92ZSBhbG9uZy4K

Cotton

Member

From: Cornwall, UK

Registered: 2004-09-17

Posts: 568

Re: Slow USB

After unloading ohci, ehci & uhci drivers, then reloading with ehci first, dmesg gives the following, but access speed has not improved:

ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
uhci_hcd: USB Universal Host Controller Interface driver
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
ohci_hcd 0000:00:01.2: found PCI INT D -> IRQ 5
ohci_hcd 0000:00:01.2: sharing IRQ 5 with 0000:00:01.3
ohci_hcd 0000:00:01.2: OHCI Host Controller
ohci_hcd 0000:00:01.2: new USB bus registered, assigned bus number 1
ohci_hcd 0000:00:01.2: irq 5, io mem 0xe4422000
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 3 ports detected
ohci_hcd 0000:00:01.3: found PCI INT D -> IRQ 5
ohci_hcd 0000:00:01.3: sharing IRQ 5 with 0000:00:01.2
ohci_hcd 0000:00:01.3: OHCI Host Controller
ohci_hcd 0000:00:01.3: new USB bus registered, assigned bus number 2
ohci_hcd 0000:00:01.3: irq 5, io mem 0xe4420000
usb usb2: configuration #1 chosen from 1 choice
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 3 ports detected
usb 2-2: new low speed USB device using ohci_hcd and address 2
usb 2-2: configuration #1 chosen from 1 choice
input: Logitech Trackball as /devices/pci0000:00/0000:00:01.3/usb2/2-2/2-2:1.0/input/input4
generic-usb 0003:046D:C404.0002: input,hidraw0: USB HID v1.10 Mouse [Logitech Trackball] on usb-0000:00:01.3-2/input0
usb 2-3: new full speed USB device using ohci_hcd and address 3
usb 2-3: configuration #1 chosen from 1 choice
hub 2-3:1.0: USB hub found
hub 2-3:1.0: 1 port detected
usb 2-3.1: new full speed USB device using ohci_hcd and address 4
usb 2-3.1: configuration #1 chosen from 1 choice
scsi3 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 4
usb-storage: waiting for device to settle before scanning
scsi 3:0:0:0: Direct-Access     Corsair  Flash Voyager    1.00 PQ: 0 ANSI: 0 CCS
sd 3:0:0:0: [sdb] 2002944 512-byte hardware sectors: (1.02 GB/978 MiB)
sd 3:0:0:0: [sdb] Write Protect is off
sd 3:0:0:0: [sdb] Mode Sense: 00 26 00 00
sd 3:0:0:0: [sdb] Assuming drive cache: write through
sd 3:0:0:0: [sdb] 2002944 512-byte hardware sectors: (1.02 GB/978 MiB)
sd 3:0:0:0: [sdb] Write Protect is off
sd 3:0:0:0: [sdb] Mode Sense: 00 26 00 00
sd 3:0:0:0: [sdb] Assuming drive cache: write through
sdb: sdb1
sd 3:0:0:0: [sdb] Attached SCSI removable disk
sd 3:0:0:0: Attached scsi generic sg2 type 0
usb-storage: device scan complete

There's an ongoing bug report for similar symptoms at: http://bugs.archlinux.org/task/12009 but its not clear if this has been resolved in the most recent kernels.