Messages in this thread | | | Date | Wed, 23 Oct 2002 09:49:54 -0700 | From | Dan Kegel <> | Subject | Re: epoll (was Re: [PATCH] async poll for 2.5) |
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Davide Libenzi <davidel@xmailserver.org> wrote: > On 22 Oct 2002, Charles 'Buck' Krasic wrote: > >> So maybe epoll's moment of utility is only transient. It should have >> been in the kernel a long time ago. Is it too late now that AIO is >> imminent? > > This is not my call actually. But beside comparing actual performance > between AIO and sys_epoll, one of the advantages that the patch had is > ... it has a very little "intrusion" in the original code by plugging > in the existing architecture.
epoll has another benefit: it works with read() and write(). That makes it easier to use with existing libraries like OpenSSL without having to recode them to use aio_read() and aio_write().
Furthermore, epoll is nice because it delivers one-shot readiness change notification (I used to think that was a drawback, but coding nonblocking OpenSSL apps has convinced me otherwise). I may be confused, but I suspect the async poll being proposed by Ben only delivers absolute readiness, not changes in readiness.
I think epoll is worth having, even if Ben's AIO already handled networking properly. - Dan
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