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The concept of Relaxed Ordering in the PCI Express environment allows switches in the path between the Requester and Completer to reorder some transactions just received before others that were previously enqueued. In ETH driver, there is no question of write integrity since each memory segment is written only once per cycle. In addition, the driver doesn't access the memory shared with the hardware until the corresponding CQE arrives indicating all PCI transactions are done. Running TCP single stream over ConnectX-4 LX, ARM CPU on remote-numa has 300% improvement in the bandwidth. With relaxed ordering turned off: BW:10 [GB/s] With relaxed ordering turned on: BW:40 [GB/s] The driver turns relaxed ordering with respect to the firmware capabilities and the return value from pcie_relaxed_ordering_enabled(). Signed-off-by: Aya Levin <ayal@mellanox.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com> |
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| 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.