On 01/03/2014 11:54 AM, Sarah Sharp wrote:
> On Fri, Jan 03, 2014 at 07:40:33AM -0800, walt wrote:
>> On 01/02/2014 11:15 AM, Sarah Sharp wrote:
>>> On Tue, Dec 31, 2013 at 12:40:16PM -0800, walt wrote:
>>>> On 12/18/2013 01:11 PM, Greg Kroah-Hartman wrote:
>>>>> 3.12-stable review patch. If anyone has any objections, please let me
>>>>> know.
>>>>>
>>>>> ------------------
>>>>>
>>>>> From: David Laight <david.lai...@aculab.com>
>>>>>
>>>>> commit 35773dac5f862cb1c82ea151eba3e2f6de51ec3e upstream.
>>>>>
>>>>> Section 4.11.7.1 of rev 1.0 of the xhci specification states that a link
>>>>> TRB
>>>>> can only occur at a boundary between underlying USB frames (512 bytes for
>>>>> high speed devices).
>>>>>
>>>>> If this isn't done the USB frames aren't formatted correctly and, for
>>>>> example,
>>>>> the USB3 ethernet ax88179_178a card will stop sending...
>>>>
>>>>
>>>> Unfortunately this patch causes a regression when copying large files to my
>>>> outboard USB3 drive. (Nothing at all to do with networking.)
>>
>>> Do you have CONFIG_USB_DEBUG turned on for 3.13? If so, you should see
>>> dmesg output from this statement shortly before your drive fails:
>>>
>>> if (num_trbs >= TRBS_PER_SEGMENT) {
>>> xhci_err(xhci, "Too many fragments %d, max %d\n",
>>> num_trbs, TRBS_PER_SEGMENT - 1);
>>> return -ENOMEM;
>>> }
>>
>> Well, the answers depend on whether the usb3 drive uses logical volumes or
>> not
>> (lvm2), which I can't explain. What I've described so far is with lvm2.
>>
>> When using lvm2 on the usb3 drive, turning on USB_DEBUG has *no* effectI'm so sorry Sarah, that was another mistake. The mistake is so stupid I'm not going to publish it here :( Once I finally ran the kernel with debugging actually compiled in, dmesg contains xhci debugging messages. Wow :) It's a big file so I zipped and attached it, which I hope is acceptable in lkml. BTW, this dmesg is from a kernel with sg_tablesize = 31, which as I said before doesn't fix the problem. The cp stopped around 7GB just as before. Sorry for the noise...
xhci.dmesg.gz
Description: application/gzip
