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18a4208826
Reduce RX DMA start latency for the first reception when port is opened for reading. Instead of waiting for an interrupt signaling data on RX FIFO or data too old on RX FIFO, start RX DMA immediately when the serial port is opened for reading. Before this patch, the average RX DMA latency for the first reception was 42489 microseconds with a standard deviation of 25721 microseconds in 36 samples. After the patch the average RX DMA latency for the first reception, when the serial port is opened for reading, is 653 microseconds with a standard deviation of 294 microseconds in 36 samples. Signed-off-by: Peter Senna Tschudin <peter.senna@collabora.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.