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Comparing libev/ev.pod (file contents):
Revision 1.212 by root, Mon Nov 3 15:13:53 2008 UTC vs.
Revision 1.213 by root, Wed Nov 5 02:48:45 2008 UTC

… …
417i.e. keep at least one watcher active per fd at all times. Stopping and 417i.e. keep at least one watcher active per fd at all times. Stopping and
418starting a watcher (without re-setting it) also usually doesn't cause 418starting a watcher (without re-setting it) also usually doesn't cause
419extra overhead. A fork can both result in spurious notifications as well 419extra overhead. A fork can both result in spurious notifications as well
420as in libev having to destroy and recreate the epoll object, which can 420as in libev having to destroy and recreate the epoll object, which can
421take considerable time and thus should be avoided. 421take considerable time and thus should be avoided.
422
423All this means that, in practise, C<EVBACKEND_SELECT> is as fast or faster
424then epoll for maybe up to a hundred file descriptors. So sad.
422 425
423While nominally embeddable in other event loops, this feature is broken in 426While nominally embeddable in other event loops, this feature is broken in
424all kernel versions tested so far. 427all kernel versions tested so far.
425 428
426This backend maps C<EV_READ> and C<EV_WRITE> in the same way as 429This backend maps C<EV_READ> and C<EV_WRITE> in the same way as

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