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8a05aa4ce3
It is observed reading the register from HW takes a bit long, for example in my box, the following difference of 'perf report --no-children fio ...' can be seen when running I/O: 1) V4.12 without patch + 9.28% fio [mtip32xx] [k] mtip_irq_handler + 8.48% fio [mtip32xx] [k] mtip_init_cmd_header 2) V4.12 with the following patch + 9.14% fio [mtip32xx] [k] mtip_irq_handler ...... + 1.14% fio [mtip32xx] [k] mtip_init_cmd_header IOPS can be increased by ~5% with this patch too. Fixes: a4e84aae8139(mtip32xx: use runtime tag to initialize command header) Signed-off-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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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.