Subject: Re: Poor performance with USB 1.1 drive connected to USB 3.0 port
Newsgroups: gmane.linux.usb.general
Date: Thursday 9th October 2014 08:45:39 UTC (over 2 years ago)
Hi Mark, I got a different result with my machine. Below is the details. >>> Kernel version [email protected]:~$ uname -a Linux allen-ivb 3.17.0+ #1 SMP Thu Oct 9 16:19:28 CST 2014 x86_64 x86_64 x86_64 GNU/Linux >>> Host controler information [email protected]:~$ lspci | grep USB 00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04) 00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 (rev 04) 00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 (rev 04) >>> Connected to USB 2.0 port via USB 1.1 hub: [email protected]:~$ lsusb -t /: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/3p, 480M |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M |__ Port 5: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M |__ Port 6: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M |__ Port 6: Dev 4, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/3p, 480M |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M |__ Port 4: Dev 3, If 0, Class=Hub, Driver=hub/3p, 12M |__ Port 1: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 12M |__ Port 1: Dev 4, If 1, Class=Human Interface Device, Driver=usbhid, 12M |__ Port 3: Dev 5, If 0, Class=Mass Storage, Driver=usb-storage, 12M [email protected]:~$ sudo ddpt if=/dev/sg2 bs=512 bpt=240 count=65536 verbose=2 [sudo] password for allen: >> Input file type: pass-through [pt] device open /dev/sg2 with flags=0x802 inquiry cdb: 12 00 00 00 24 00 /dev/sg2: ASMT 2105 0 [pdt=0] >> Output file type: null device read capacity (10) cdb: 25 00 00 00 00 00 00 00 00 00 /dev/sg2 [pt]: blocks=62500000 [0x3b9aca0], _bs=512, 32.00 GB skip=0 (blocks on input), seek=0 (blocks on output) ibs=512 bytes, obs=512 bytes, OBPC=0 initial count=65536 (blocks of input), blocks_per_transfer=240 Output file not specified so no copy, just reading input 65536+0 records in 0+0 records out time to read data: 30.037081 secs at 1.12 MB/sec >>> Connected to USB 3.0 port via USB 1.1 hub: [email protected]:~$ lsusb -t /: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M |__ Port 3: Dev 2, If 0, Class=Hub, Driver=hub/3p, 12M |__ Port 1: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 12M |__ Port 1: Dev 3, If 1, Class=Human Interface Device, Driver=usbhid, 12M |__ Port 3: Dev 5, If 0, Class=Mass Storage, Driver=usb-storage, 12M /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/3p, 480M |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M |__ Port 5: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M |__ Port 6: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M |__ Port 6: Dev 4, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/3p, 480M |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M [email protected]:~$ sudo ddpt if=/dev/sg2 bs=512 bpt=240 count=65536 verbose=2 >> Input file type: pass-through [pt] device open /dev/sg2 with flags=0x802 inquiry cdb: 12 00 00 00 24 00 /dev/sg2: ASMT 2105 0 [pdt=0] >> Output file type: null device read capacity (10) cdb: 25 00 00 00 00 00 00 00 00 00 /dev/sg2 [pt]: blocks=62500000 [0x3b9aca0], _bs=512, 32.00 GB skip=0 (blocks on input), seek=0 (blocks on output) ibs=512 bytes, obs=512 bytes, OBPC=0 initial count=65536 (blocks of input), blocks_per_transfer=240 Output file not specified so no copy, just reading input 65536+0 records in 0+0 records out time to read data: 27.816240 secs at 1.21 MB/sec Thanks, -baolu On 09/30/2014 05:19 PM, Mark Knibbs wrote: > On Tue, 30 Sep 2014 14:10:28 +0800 > "Lu, Baolu"wrote: > >> On 9/30/2014 5:03 AM, Mark Knibbs wrote: >>> Great. I hope someone else is motivated to reproduce the issue. It will >>> take a long time for me to bisect due to my slow computer. >> Hi Mark, >> >> I tried to reproduce this issue. I connected a USB key under a >> full-speed hub. > Just to confirm, I do see the slowdown with a USB 2.0 drive connected to > USB 1.1 hub connected to USB 3.0 port. My results (kernel 3.17-rc6): > > Connected to USB 3.0 port via USB 1.1 hub: > > # ddpt if=/dev/sg6 bs=512 bpt=240 count=65536 verbose=2 > >> Input file type: pass-through [pt] device > open /dev/sg6 with flags=0x802 > inquiry cdb: 12 00 00 00 24 00 > /dev/sg6: Freecom DataBar USB2.0 2.00 [pdt=0] > >> Output file type: null device > read capacity (10) cdb: 25 00 00 00 00 00 00 00 00 00 > /dev/sg6 [readcap]: num_blocks=127908 [0x1f3a4], block_size=512, 65 MB > skip=0 (blocks on input), seek=0 (blocks on output) > ibs=512 bytes, obs=512 bytes, OBPC=0 > initial count=65536 (blocks of input), blocks_per_transfer=240 > Output file not specified so no copy, just reading input > 65536+0 records in > 0+0 records out > time to read data: 58.147836 secs at 577.1 KB/sec > > > Connected to USB 2.0 port via USB 1.1 hub: > > # ddpt if=/dev/sg6 bs=512 bpt=240 count=65536 verbose=2 > >> Input file type: pass-through [pt] device > open /dev/sg6 with flags=0x802 > inquiry cdb: 12 00 00 00 24 00 > /dev/sg6: Freecom DataBar USB2.0 2.00 [pdt=0] > >> Output file type: null device > read capacity (10) cdb: 25 00 00 00 00 00 00 00 00 00 > /dev/sg6 [readcap]: num_blocks=127908 [0x1f3a4], block_size=512, 65 MB > skip=0 (blocks on input), seek=0 (blocks on output) > ibs=512 bytes, obs=512 bytes, OBPC=0 > initial count=65536 (blocks of input), blocks_per_transfer=240 > Output file not specified so no copy, just reading input > 65536+0 records in > 0+0 records out > time to read data: 39.146843 secs at 857.1 KB/sec > > > Mark -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html