7ec0596f89
Use the newly added DPIO service API to map cpu-affine DPIO services to channels. The DPAA2 Ethernet driver already had mappings of frame queues and channels to cpus, but had no control over the DPIOs used. We can now ensure full affinity of hotpath hardware resources to cores, which improves performance and almost eliminates some resource contentions (e.g. enqueue/dequeue busy counters should be close to zero from now on). Making the pull channel operation core affine brings the most significant benefits. This ensures the same DPIO service will be used for all dequeue commands issued for a certain frame queue, which is in line with the way hardware is optimized. Additionally, we also use affine DPIOs for the frame enqueue and buffer release operations in order to avoid resource contention. dpaa2_io_service_register() and dpaa2_io_service_rearm() functions receive an affine DPIO as argument mostly for uniformity, but this doesn't change the previous functionality. Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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README
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.