Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1305164

Re: [PATCH v2] Add support for usbfs zerocopy.

From Lingzhu Xiang <lingzhu.xiang@mail.utoronto.ca>
Newsgroups linux.kernel
Subject Re: [PATCH v2] Add support for usbfs zerocopy.
Date 2016-01-09 05:20 +0100
Message-ID <qOTap-81-9@gated-at.bofh.it> (permalink)
References <qNJZw-1V2-3@gated-at.bofh.it> <qNK9d-1YP-19@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

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

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Does vm_operations_struct require a .owner field? Alan Stern <stern@rowland.harvard.edu> - 2016-01-05 17:30 +0100
  Re: Does vm_operations_struct require a .owner field? "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-01-05 22:00 +0100
    Re: Does vm_operations_struct require a .owner field? Alan Stern <stern@rowland.harvard.edu> - 2016-01-05 22:40 +0100
      Re: Does vm_operations_struct require a .owner field? "Steinar H. Gunderson" <sesse@google.com> - 2016-01-06 01:00 +0100
      [PATCH] Add support for usbfs zerocopy. "Steinar H. Gunderson" <sesse@google.com> - 2016-01-06 01:00 +0100
        Re: [PATCH] Add support for usbfs zerocopy. Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-01-06 01:20 +0100
          Re: [PATCH] Add support for usbfs zerocopy. "Steinar H. Gunderson" <sesse@google.com> - 2016-01-06 01:30 +0100
          [PATCH v2] Add support for usbfs zerocopy. "Steinar H. Gunderson" <sesse@google.com> - 2016-01-06 01:30 +0100
            Re: [PATCH v2] Add support for usbfs zerocopy. Lingzhu Xiang <lingzhu.xiang@mail.utoronto.ca> - 2016-01-07 03:40 +0100
              Re: [PATCH v2] Add support for usbfs zerocopy. Alan Stern <stern@rowland.harvard.edu> - 2016-01-07 16:50 +0100
                Re: [PATCH v2] Add support for usbfs zerocopy. Oliver Neukum <oneukum@suse.com> - 2016-01-11 12:20 +0100
                Re: [PATCH v2] Add support for usbfs zerocopy. Oliver Neukum <oneukum@suse.com> - 2016-01-12 11:10 +0100
            Re: [PATCH v2] Add support for usbfs zerocopy. Lingzhu Xiang <lingzhu.xiang@mail.utoronto.ca> - 2016-01-09 05:20 +0100
              Re: [PATCH v2] Add support for usbfs zerocopy. "Steinar H. Gunderson" <sesse@google.com> - 2016-01-09 12:00 +0100
        Re: [PATCH] Add support for usbfs zerocopy. Christoph Hellwig <hch@infradead.org> - 2016-01-06 07:50 +0100
          Re: [PATCH] Add support for usbfs zerocopy. "Steinar H. Gunderson" <sesse@google.com> - 2016-01-06 15:50 +0100
            Re: [PATCH] Add support for usbfs zerocopy. Peter Stuge <peter@stuge.se> - 2016-01-06 16:30 +0100
              Re: [PATCH] Add support for usbfs zerocopy. "Steinar H. Gunderson" <sesse@google.com> - 2016-01-06 16:40 +0100
              Re: [PATCH] Add support for usbfs zerocopy. Alan Stern <stern@rowland.harvard.edu> - 2016-01-06 16:40 +0100
            Re: [PATCH] Add support for usbfs zerocopy. Alan Stern <stern@rowland.harvard.edu> - 2016-01-06 16:40 +0100
              Re: [PATCH] Add support for usbfs zerocopy. Christoph Hellwig <hch@infradead.org> - 2016-01-08 10:50 +0100
                RE: [PATCH] Add support for usbfs zerocopy. David Laight <David.Laight@ACULAB.COM> - 2016-01-08 11:30 +0100
                Re: [PATCH] Add support for usbfs zerocopy. Oliver Neukum <oneukum@suse.com> - 2016-01-08 17:10 +0100
                Re: [PATCH] Add support for usbfs zerocopy. "Steinar H. Gunderson" <sesse@google.com> - 2016-01-12 22:30 +0100
                Re: [PATCH] Add support for usbfs zerocopy. Alan Stern <stern@rowland.harvard.edu> - 2016-01-12 23:10 +0100
                Re: [PATCH] Add support for usbfs zerocopy. Lingzhu Xiang <lingzhu.xiang@mail.utoronto.ca> - 2016-01-13 08:10 +0100
                Re: [PATCH] Add support for usbfs zerocopy. Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-01-13 18:30 +0100
            Re: [PATCH] Add support for usbfs zerocopy. Christoph Hellwig <hch@infradead.org> - 2016-01-08 10:50 +0100

csiph-web