On Fri, 2005-02-04 at 12:41 -0800, David Brownell wrote:
> On Friday 04 February 2005 4:16 am, Rusty Russell wrote:
> >
> > Is USB/SCSI just terminally broken under 2.6?
>
> I don't think so, but there are problems that appear in some
> hardware configs and not others. Many folk report no problems;
> a (very) few report nothing but.
>
> If you've verified this on 2.6.10, then you certainly have
> have the ehci-hcd (re)queueing race fix that has made a big
> difference for some folk. I don't know of any other issues
> in that driver that could explain usb-storage problems.
>
> What hardware config do you have?
>
> - Whose EHCI controller and revision? I've never had
> good luck with VIA VT6202. ("lspci -v".)
OK, it's an IBM Thinkpad X31:
0000:00:1d.7 USB Controller: Intel Corp. 82801DB/DBM (ICH4/ICH4-M) USB 2.0 EHCI
Controller (rev 01) (prog-if 20 [EHCI])
Subsystem: IBM: Unknown device 052e
Flags: bus master, medium devsel, latency 0, IRQ 11
Memory at c0000000 (32-bit, non-prefetchable) [size=1K]
Capabilities: [50] Power Management version 2
Capabilities: [58] #0a [2080]
Kernel messages when plugged in:
usb 4-3: new high speed USB device using address 5
scsi3 : SCSI emulation for USB Mass Storage devices
Vendor: HTS72606 Model: 0M9AT00 Rev: MH4O
Type: Direct-Access ANSI SCSI revision: 02
SCSI device sda: 117210240 512-byte hdwr sectors (60012 MB)
sda: assuming drive cache: write through
/dev/scsi/host3/bus0/target0/lun0: p1 p2 < p5 p6 p7 p8 p9 >
Attached scsi disk sda at scsi3, channel 0, id 0, lun 0
USB Mass Storage device found at 5
> - Whose USB storage adapter? ("lsusb -v", or in this
> case the /proc/bus/usb/devices entry would be ok.)
> GeneSys adapters have been the most problematic,
> but they're hardly the only ones with quirks.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0dc4 Macpower Peripherals, Ltd
idProduct 0x00c4
bcdDevice 0.02
iManufacturer 1 Macpower
iProduct 2 2.5HDD
iSerial 3 8000D1
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 4 Myson 8818
bmAttributes 0xc0
Self Powered
MaxPower 10mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 5 SFF-8070i
bInterfaceProtocol 80
iInterface 5 USB2.0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x03 EP 3 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
> Thing is, that driver stack isn't especially thin: SCSI isn't
> the top, and it's got usb-storage, usbcore, and a USB HCD under
> it. That makes it harder to track down root causes, even when
> there is just a single one and it's in those drivers (rather
> than being hardware misbehavior).
I have some spare partitions on the disk, so I've written a program
which writes using DIRECT_IO and verifies the results. It took less
than an hour under my filesystem load, so I'll see if I can get this to
trigger it (currently N children writing to separate blocks, but if that
doesn't trigger it I'll get more sophisticated with readers and
writers).
Thanks for the response,
Rusty.
--
A bad analogy is like a leaky screwdriver -- Richard Braakman
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