Messages in this thread | | | From | Lingzhu Xiang <> | Date | Fri, 8 Jan 2016 23:00:54 -0500 | Subject | Re: [PATCH v2] Add support for usbfs zerocopy. |
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On Wed, Nov 25, 2015 at 7:19 PM, Steinar H. Gunderson <sesse@google.com> wrote: > Add a new interface for userspace to preallocate memory that can be > used with usbfs. This gives two primary benefits:
Extended testing over one hour shows significant improved CPU usage and stability: The old CPU usage is about 12% +/- 5%. The new CPU usage is 4% +/- 1%.
The setup is an i7-4600U laptop running Kinect v2 with 260MB/s isochronous and 20MB/s bulk transfers.
The improvement in reducing jitter is particularly preferable to Kinect v2 driver because the isochronous data is structured and one packet lost means discarding a lot of data.
Regards, Lingzhu
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