Messages in this thread | | | Date | Mon, 02 Jun 2003 10:13:25 -0700 | From | David Brownell <> | Subject | Re: USB 2.0 with 250Gb disk and insane loads |
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Alexander Hoogerhuis wrote: > > I had a private reply form a guy that had three of these running > reliably on 2.4.21-pre6, and he noted he'd never done cd->disk > transfers, but across the net. So I did the same. > > Results are that it survived a lot longer, I managed to get about > 700Mb across at about 8Mb/s (line speed 100mbit half duplex) before it > fell over with this: > > ... > usb-storage: Command WRITE_10 (10 bytes) > usb-storage: 2a 00 18 f0 34 47 00 04 00 00 > usb-storage: Bulk command S 0x43425355 T 0xc43 Trg 0 LUN 0 L 524288 F 0 CL 10 > usb-storage: usb_stor_bulk_transfer_buf: xfer 31 bytes > usb-storage: Status code 0; transferred 31/31 > usb-storage: -- transfer complete > usb-storage: Bulk command transfer result=0
> usb-storage: usb_stor_bulk_transfer_sglist: xfer 524288 bytes, 128 entries > usb-storage: Status code 0; transferred 524288/524288 > usb-storage: -- transfer complete > usb-storage: Bulk data transfer result 0x0
That's two successive operations on the OUT endpoint (two IRQs: request, then 128 pages) both of which worked fine, followed by one on the IN endpoint:
> usb-storage: Attempting to get CSW... > usb-storage: usb_stor_bulk_transfer_buf: xfer 13 bytes > usb-storage: usb_storage_command_abort called > usb-storage: usb_stor_stop_transport called > usb-storage: -- cancelling URB > usb-storage: Status code -104; transferred 0/13 > usb-storage: -- transfer cancelled > usb-storage: Bulk status result = 3 > usb-storage: -- command was aborted > ...
Interesting. So basically, the failure mode you saw was that after all the data was (evidently) transferred OK, usb-storage aborted (for some reason) its fetch for the transfer status ... and then trouble.
Why did usb-storage abort that IN transfer? If we knew that, we'd have a good clue as to what's going wrong.
> Load only got up to about 3-4 before it fell over. > > Apart from that, it seems the speed at which it falls over is depening > on two factors: with/without debugging and speed at which data arrives > for the drive.
Not unrelated. Turning on usb-storage debug slows down the rate at which data is handed to the drive.
- Dave
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