Re: USB slow when two devices connected

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On Tue, Sep 2, 2008 at 12:26 PM, Phil Meyer <[email protected]> wrote:
> Aldo Foot wrote:
>>
>> My F8 system has two USB ports in the front side.
>> I had a USB DVDRW connected to one of the ports and was writing an ISO
>> image to CDR.
>> Then I plugged in a USB stick to transfer some files from it to my
>> desktop, the transfer
>> was stalling and was slow even after the CDR task ended. Then I
>> unplugged the DVDRW
>> and the USB stick transfer rate was as fast as lightning.
>> Why was the USB stick file transfer so slow when the DVDRW was plugged in?
>>
>> ~af
>>
>>
>
> Most modern mother boards offer as many as 8 USB ports on as many as 4
> different USB controllers.  However, there are many motherboards that offer
> only 4 total USB ports on a single controller.
>
> lsusb is useful to determine what's what in your particular system.
>
> # yum install usbutils
>
> if you need to.
>
> All that, to say this:  a single slow USB device on a controller will cause
> the controller to drop to slow (USB 1.1) mode.   Not just a single port
> drops, the whole controller drops.
>
> Plug both devices in at the same time and check lsusb output.  Are they both
> on the same controller.  Check dmesg output.  Did the USB driver complain
> about a 'slow' USB device?
>
> Again, using lsusb, it is possible to plug in the second device in a
> different slot, and have it show up on a different USB controller.
>
> On my laptop (newish) the two ports on the side are together, and the two on
> the back are together on a different controller.  Many laptops use at least
> one USB controller for internal connections.  Mine has an internal
> Bluetooth, and sits on a USB controller.
>
> This problem used to be very problematic when most USB mice and keyboards
> were USB 1.1
>
> Now days, all USB devices should say 2.0 on them somewhere.
>
> Here is a sample output from lsusb:
> -> lsusb
> Bus 002 Device 006: ID 1307:0163 Transcend Information, Inc. 512MB USB Flash
> Drive
> Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 006 Device 009: ID 046d:c03f Logitech, Inc. UltraX Optical Mouse
> Bus 006 Device 008: ID 050d:0109 Belkin Components F5U109/F5U409 PDA Adapter
> Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 005 Device 003: ID 051d:0002 American Power Conversion Uninterruptible
> Power Supply
> Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 003 Device 005: ID 0a5c:4503 Broadcom Corp.
> Bus 003 Device 004: ID 0a5c:4502 Broadcom Corp.
> Bus 003 Device 003: ID 413c:8126 Dell Computer Corp. Wireless 355 Bluetooth
> Bus 003 Device 002: ID 0a5c:4500 Broadcom Corp.
> Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
>
> The thumb drive and APC are on the side of my laptop on different
> controllers.
> The Belkin USB serial device and the Logitech mouse are plugged into the
> back, and are on the same controller.  Your Mileage will vary.
>
> When my mouse plugs in, dmesg says this:
> usb 6-2: new low speed USB device using uhci_hcd and address 9
> usb 6-2: configuration #1 chosen from 1 choice
> input: Logitech USB-PS/2 Optical Mouse as
> /devices/pci0000:00/0000:00:1d.1/usb6/6-2/6-2:1.0/input/input18
> input,hidraw0: USB HID v1.10 Mouse [Logitech USB-PS/2 Optical Mouse] on
> usb-0000:00:1d.1-2
>
> Please note the words/phrases LOW SPEED and 1.1.  If I plugged my thumb
> drive into the back at the same time my mouse was plugged in, in the back,
> transfers would drop to about 1MB/sec.
>
> Good Luck!
>
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Well I learned something today.
My USB stick seems to behave erratically. It behaves as before even when I
have the USB DVDRW connected to the front panel and the USB stick on the back.

>From lsusb output
Bus 001 Device 007: ID 0457:0151 Silicon Integrated Systems Corp.
Super Flash 1GB Flash Drive
Bus 001 Device 005: ID 054c:02d1 Sony Corp.

>From /var/log/messages (google did not showed anything on error -71)

Sep  2 13:54:47 xxx kernel: usb 1-6: new high speed USB device using
ehci_hcd and address 6
Sep  2 13:54:47 xxx kernel: usb 1-6: device descriptor read/all, error -71
Sep  2 13:54:48 xxx kernel: usb 1-6: new high speed USB device using
ehci_hcd and address 7
Sep  2 13:54:48 xxx kernel: usb 1-6: configuration #1 chosen from 1 choice
Sep  2 13:54:48 xxx kernel: scsi6 : SCSI emulation for USB Mass Storage devices
Sep  2 13:54:53 xxx kernel: scsi 6:0:0:0: Direct-Access     USB007
mini-USB2BU      0.00 PQ: 0 ANSI: 2
Sep  2 13:54:53 xxx kernel: sd 6:0:0:0: [sdd] 1003520 512-byte
hardware sectors (514 MB)
Sep  2 13:54:53 xxx kernel: sd 6:0:0:0: [sdd] Write Protect is off
Sep  2 13:54:53 xxx kernel: sd 6:0:0:0: [sdd] Assuming drive cache:
write through
Sep  2 13:55:23 xxx kernel: usb 1-6: reset high speed USB device using
ehci_hcd and address 7
Sep  2 13:55:23 xxx kernel: sd 6:0:0:0: [sdd] 1003520 512-byte
hardware sectors (514 MB)
Sep  2 13:55:23 xxx kernel: sd 6:0:0:0: [sdd] Write Protect is off
Sep  2 13:55:23 xxx kernel: sd 6:0:0:0: [sdd] Assuming drive cache:
write through
Sep  2 13:55:23 xxx kernel: sdd:<6>usb 1-6: reset high speed USB
device using ehci_hcd and address 7
<...snip...>
Sep  2 13:55:24 xxx kernel: usb 1-6: device not accepting address 7, error -71
Sep  2 13:56:30 xxx kernel: end_request: I/O error, dev sdd, sector 0
Sep  2 13:56:30 xxx kernel: Buffer I/O error on device sdd, logical block 0
Sep  2 13:56:30 xxx kernel: Dev sdd: unable to read RDB block 0
Sep  2 13:56:30 xxx kernel: unable to read partition table
Sep  2 13:56:30 xxx kernel: sd 6:0:0:0: [sdd] Attached SCSI removable disk
Sep  2 13:56:30 xxx kernel: sd 6:0:0:0: Attached scsi generic sg5 type 0
Sep  2 13:56:30 xxx kernel: usb 1-6: reset high speed USB device using
ehci_hcd and address 7

I also got this message when I plugged the the usb stick into a CentOS
5.2 laptop.
smartd: Device: /dev/hda, 1 currently unreadable (pending) sector

maybe the usb stick is on its last leg.
~af

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