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Yuchung Cheng says: ==================== tcp: improving RACK cpu performance This patch set improves the CPU consumption of the RACK TCP loss recovery algorithm, in particular for high-speed networks. Currently, for every ACK in recovery RACK can potentially iterate over all sent packets in the write queue. On large BDP networks with non-trivial losses the RACK write queue walk CPU usage becomes unreasonably high. This patch introduces a new queue in TCP that keeps only skbs sent and not yet (s)acked or marked lost, in time order instead of sequence order. With that, RACK can examine this time-sorted list and only check packets that were sent recently, within the reordering window, per ACK. This is the fastest way without any write queue walks. The number of skbs examined per ACK is reduced by orders of magnitude. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.