forked from Minki/linux
mainlining shenanigans
5588d62802
DisplayLink ethernet devices require NTB buffers larger then 32kb in order to run with highest performance. This patch is changing upper limit of the rx and tx buffers. Those buffers are initialized with CDC_NCM_NTB_DEF_SIZE_RX and CDC_NCM_NTB_DEF_SIZE_TX which is 16kb so by default no device is affected by increased limit. Rx and tx buffer is increased under two conditions: - Device need to advertise that it supports higher buffer size in dwNtbMaxInMaxSize and dwNtbMaxOutMaxSize. - cdc_ncm/rx_max and cdc_ncm/tx_max driver parameters must be adjusted with udev rule or ethtool. Summary of testing and performance results: Tests were performed on following devices: - DisplayLink DL-3xxx family device - DisplayLink DL-6xxx family device - ASUS USB-C2500 2.5G USB3 ethernet adapter - Plugable USB3 1G USB3 ethernet adapter - EDIMAX EU-4307 USB-C ethernet adapter - Dell DBQBCBC064 USB-C ethernet adapter Performance measurements were done with: - iperf3 between two linux boxes - http://openspeedtest.com/ instance running on local test machine Insights from tests results: - All except one from third party usb adapters were not affected by increased buffer size to their advertised dwNtbOutMaxSize and dwNtbInMaxSize. Devices were generally reaching 912-940Mbps both download and upload. Only EDIMAX adapter experienced decreased download size from 929Mbps to 827Mbps with iper3, with openspeedtest decrease was from 968Mbps to 886Mbps. - DisplayLink DL-3xxx family devices experienced performance increase with iperf3 download from 300Mbps to 870Mbps and upload from 782Mbps to 844Mbps. With openspeedtest download increased from 556Mbps to 873Mbps and upload from 727Mbps to 973Mbps - DiplayLink DL-6xxx family devices are not affected by increased buffer size. Signed-off-by: Łukasz Spintzyk <lukasz.spintzyk@synaptics.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20220720060518.541-2-lukasz.spintzyk@synaptics.com Signed-off-by: Paolo Abeni <pabeni@redhat.com> |
||
|---|---|---|
| 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.