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48 lines
1.6 KiB
Plaintext
48 lines
1.6 KiB
Plaintext
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Most operating systems limit an amount of TCP sockets that can be used
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simultaneously. It is possible for a busy Tor relay to run into these
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limits, thus being unable to fully utilize the bandwidth resources it
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has at its disposal. Following system-specific tips might be helpful
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to alleviate the aforementioned problem.
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Linux
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-----
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Use 'ulimit -n' to raise an allowed number of file descriptors to be
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opened on your host at the same time.
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FreeBSD
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-------
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Tune the followind sysctl(8) variables:
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* kern.maxfiles - maximum allowed file descriptors (for entire system)
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* kern.maxfilesperproc - maximum file descriptors one process is allowed
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to use
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* kern.ipc.maxsockets - overall maximum numbers of sockets for entire
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system
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* kern.ipc.somaxconn - size of listen queue for incoming TCP connections
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for entire system
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See also:
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* https://www.freebsd.org/doc/handbook/configtuning-kernel-limits.html
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* https://wiki.freebsd.org/NetworkPerformanceTuning
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Mac OS X
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--------
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Since Mac OS X is BSD-based system, most of the above hold for OS X as well.
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However, launchd(8) is known to modify kern.maxfiles and kern.maxfilesperproc
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when it launches tor service (see launchd.plist(5) manpage). Also,
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kern.ipc.maxsockets is determined dynamically by the system and thus is
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read-only on OS X.
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Disclaimer
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----------
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Do note that this document is a draft and above information may be
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technically incorrect and/or incomplete. If so, please open a ticket
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on https://trac.torproject.org or post to tor-relays mailing list.
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Are you running a busy Tor relay? Let us know how you are solving
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the out-of-sockets problem on your system.
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