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    SubjectRe: [PATCH 3.12 033/118] usb: xhci: Link TRB must not occur within a USB payload burst
    On 14-01-02 02:15 PM, Sarah Sharp wrote:
    > On Tue, Dec 31, 2013 at 12:40:16PM -0800, walt wrote:
    ..
    >> Unfortunately this patch causes a regression when copying large files to my
    >> outboard USB3 drive. (Nothing at all to do with networking.)
    >>
    >> When I try to copy a large (20GB) file to the USB3 drive, the copy dies after
    >> about 7GB, the ext4 journal aborts and the drive is remounted read-only.
    >>
    >> This bug is 100% reproducible (always pretty close to 7GB) and reverting this
    >> patch completely fixes the problem.
    >
    > Ok, I had feared that would be a consequence of this patch. I think the
    > problem is that the usb-storage driver submitted an URB with more
    > scatter-gather entries than would fit on the ring segment, the xHCI
    > driver rejected the URB with -ENOMEM, and the SCSI core eventually gave
    > up on the SCSI command.


    Is there not a block layer / scheduler tunable for max sg entries or something?
    --
    Mark Lord
    Real-Time Remedies Inc.
    mlord@pobox.com


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