Linux mainline fork with MSM8998 patches | https://mainline.space | Currently supported devices:
OnePlus 5/5T, Xiaomi Mi 6, F(x)tec Pro¹ (2019 QX1000 model) & Sony Xperia XZ Premium (UNTESTED!)
36dc01657b
Patch "USB: HCD: support giveback of URB in tasklet context"[1]
introduced giveback of urb in tasklet context. [1] This patch was
applied to ehci but not xhci. [2] This patch significantly reduces
the hard irq time of xhci. Especially for uvc driver, the hard irq
including the uvc completion function runs quite long but applying
this patch reduces the hard irq time of xhci.
I have tested four SS devices to check if performance degradation
occurs when urb completion functions run in the tasklet context.
As a result of the test, all devices works well and shows very
similar performance with the upstream kernel. Moreover, usb ethernet
adapter show better performance than the upstream kernel about 5% for
RX and 2% for TX. Four SS devices is as follows.
SS devices for test
1. WD My Passport 2TB (external hard drive)
2. Sandisk Ultra Flair USB 3.0 32GB
3. Logitech Brio webcam
4. Iptime 1gigabit ethernet adapter (Mediatek RTL8153)
Test description
1. Mass storage (hard drive) performance test
- run below command 10 times and compute the average performance
dd if=/dev/sdN iflag=direct of=/dev/null bs=1G count=1
2. Mass storage (flash memory) performance test
- run below command 10 times and compute the average performance
dd if=/dev/sdN iflag=direct of=/dev/null bs=1G count=1
3. Webcam streaming performance test
- run simple capture program and get the average frame rate per second
- capture 1500 frames
- program link
https://github.com/asfaca/Webcam-performance-analyzing-tool
- video resolution : 4096 X 2160 (4K) at 30 or 24 fps
- device (Logitech Brio) spec url for the highest resolution and fps
https://support.logitech.com/en_gb/product/brio-stream/specs
4. USB Ethernet adapter performance test
- directly connect two linux machines with ethernet cable
- run pktgen of linux kernel and send 1500 bytes packets
- run vnstat to measure the network bandwidth for 180 seconds
Test machine
- CPU : Intel i5-7600 @ 3.5GHz
Test results
1. Mass storage (hard drive) performance test
WD My Passport 2TB (external hard drive)
--------------------------------------------------------------------
xhci without tasklet | xhci with tasklet
--------------------------------------------------------------------
103.667MB/s | 103.692MB/s
--------------------------------------------------------------------
2. Mass storage (flash memory) performance test
Sandisk Ultra Flair USB 3.0 32GB
--------------------------------------------------------------------
xhci without tasklet | xhci with tasklet
--------------------------------------------------------------------
129.727MB/s | 130.2MB/s
--------------------------------------------------------------------
3. Webcam streaming performance test
Logitech Brio webcam
--------------------------------------------------------------------
xhci without tasklet | xhci with tasklet
--------------------------------------------------------------------
26.4451 fps | 26.3949 fps
--------------------------------------------------------------------
4. USB Ethernet adapter performance test
Iptime 1gigabit ethernet adapter (Mediatek RTL8153)
--------------------------------------------------------------------
xhci without tasklet | xhci with tasklet
--------------------------------------------------------------------
RX 933.86 Mbit/s | 983.86 Mbit/s
--------------------------------------------------------------------
TX 830.18 Mbit/s | 882.75 Mbit/s
--------------------------------------------------------------------
[1], https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=94dfd7edfd5c9b605caf7b562de7a813d216e011
[2], https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=428aac8a81058e2303677a8fbf26670229e51d3a
Signed-off-by: Suwan Kim <suwan.kim027@gmail.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/1573836603-10871-4-git-send-email-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.