On Tue, 10 Nov 2015, Steinar H. Gunderson wrote:
> On Mon, Nov 02, 2015 at 11:48:36AM -0500, Alan Stern wrote:
> > Order 7? Maybe you're trying to put too much data into a single
> > transfer and encountering problems with memory fragmentation. Try
> > using more frequent, smaller transfers.
>
> I tried going down to 128 kB; it still happens (and if I go even further
> down, I can't seem to keep up the data stream reliably, even with realtime
> priority on my USB thread -- perhaps not so strange, since that's ~1000
> submits per second already).
You could try getting a "zerocopy" patch to work. See this thread:
http://marc.info/?l=linux-usb&m=140431709523840&w=2
Alan Stern
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