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UMR operations are more frequent and important. Check them first, and add a compiler branch predictor hint. According to current design, ICOSQ CQ can contain at most one pending CQE per napi. Poll function is optimized accordingly. Performance: Single-stream packet-rate tested with pktgen. Packets are dropped in tc level to zoom into driver data-path. Larger gain is expected for larger packet sizes, as BW is higher and UMR posts are more frequent. --------------------------------------------- packet size | before | after | gain | 64B | 4,092,370 | 4,113,306 | 0.5% | 1024B | 3,421,435 | 3,633,819 | 6.2% | Signed-off-by: Tariq Toukan <tariqt@mellanox.com> Cc: kernel-team@fb.com Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
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.