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nosoftlockup - disables logging of backtraces when a process executes on a CPU for longer than the softlockup threshold (default 120 seconds). Typical low-latency programming and tuning techniques might involve spinning on a core or modifying scheduler priorities/policies, which can lead to a task reaching this threshold. If a task has not relinquished the CPU for 120 seconds, the kernel prints a backtrace for diagnostic purposes. Adding nosoftlockup to the cmdline disables the printing of this backtrace (the printk itself can cause latency spikes), and does not in itself reduce latency. Tasks that spin on a CPU must occasionally yield (especially if they are SCHED_FIFO priority), or important per-cpu kernel threads may never execute, potentially leading to unexpected behavior such as very large latency spikes or interruptions in network traffic. mce=ignore_ce - ignores corrected errors and associated scans that can cause periodic latency spikes. Documentation: https://access.redhat.com/sites/default/files/attachments/201501-perf-brief-low-latency-tuning-rhel7-v1.1.pdf Change-Id: Ieaedb58d018ddb85ec46e8fe69729596993aabf1 Signed-off-by: Panchajanya1999 <panchajanya@azure-dev.live> Signed-off-by: Richard Raya <rdxzv.dev@gmail.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.