On 10/09/2014 07:07 PM, Mark Knibbs wrote:
[For removable media, it's a good idea to disable polling for medium
changes before running a test. Depending on kernel & distribution that could
be achieved by doing
udisks --inhibit-all-polling
and/or for example
echo -1 >/sys/block/sdb/events_poll_msecs
before running the test.]
I still can't reproduce this issue.
>>> Disable polling
root@allen-ivb:/home/allen# 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
root@allen-ivb:/home/allen# udisks --inhibit-all-polling
Inhibiting polling on all devices. Press Ctrl+C to exit.
>>> Change to another terminal
>>> Connected to USB 2.0 port via USB 1.1 hub:
root@allen-ivb:/home/allen# 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
root@allen-ivb:/home/allen# 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: 30.097182 secs at 1.11 MB/sec
>>> Connected to USB 3.0 port via USB 1.1 hub:
root@allen-ivb:/home/allen# 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 4, 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
root@allen-ivb:/home/allen# 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: 27.900788 secs at 1.20 MB/sec
Thanks,
-baolu
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