On Tue, Sep 2, 2008 at 12:26 PM, Phil Meyer <pmeyer@xxxxxxxxxxxxxxxx> 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! > > -- > fedora-list mailing list > fedora-list@xxxxxxxxxx > To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list > Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines > 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 -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
