On Mon, 2 Nov 2015, Steinar H. Gunderson wrote: > > Once the data is in the kernel, the rest of the procedure is basically > > zero-copy. The problem is getting it there from within your program. > > We currently don't have any support for zero-copy data submissions, > > although it has been proposed a few times in the past. > > Do you know if there's any plans to revive these proposals? I've seen them in > the archives, too, but they all seem to have died down. It seems each stream > costs me ~15% or so of one core (mostly in copy_user_enhanced_fast_string and > memset_erms, which I suppose are about copying to user space), and I'm a bit > strapped for CPU already. I haven't heard of any plans. And I don't remember whether the earlier proposals covered isochronous or were only for bulk transfers. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
