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The connection backlog passed to listen() denotes the number of connections that are fully established, but that have not yet been accept()ed. If the amount goes above that level, new connection requests will be dropped on the floor until the value goes down. If all the knfsd threads are bogged down in (e.g.) disk I/O, new connection attempts can stall because of this. For the same rationale that Trond points out in the userland patch [1], ensure that svc_xprt sockets created by the kernel allow SOMAXCONN (4096) backlogged connections instead of the 64 that they do today. [1]: https://lore.kernel.org/linux-nfs/20240308180223.2965601-1-trond.myklebust@hammerspace.com/ Cc: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
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.