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    SubjectRe: [PATCH] epoll more scalable than poll
    On Mon, 28 Oct 2002, Martin Waitz wrote:

    > hi :)
    >
    > On Mon, Oct 28, 2002 at 11:14:19AM -0800, Hanna Linder wrote:
    > > The results of our testing show not only does the system call
    > > interface to epoll perform as well as the /dev interface but also that epoll
    > > is many times better than standard poll. No other implementations of poll
    > > have performed as well as epoll in any measure. Testing details and results
    > > are published here, please take a minute to check it out: http://lse.sourceforge.net/epoll/index.html
    > how does this compare to the kqueue mechanism found in {Free,Net}BSD?
    > (see http://people.freebsd.org/~jlemon/papers/kqueue.pdf)
    >
    > i especially like their combined event update/event wait,
    > needing only one syscall per poll while building a changelist in
    > userspace...
    >
    > a replacement for poll/select is _really_ needed.
    > but i think we should use existing interfaces if possible,
    > to reduce the changes needed in userspace.

    KQueue has not been tested simply because it does not ( to my knowledge )
    have patches to apply to lk. I'd expect kqueue to scale in a similar way
    of sys_epoll though. Where for "similar" I mean to not suffer high
    connection load drops. About the interface, it looks pretty simple to me :

    http://www.xmailserver.org/linux-patches/epoll_create.txt
    http://www.xmailserver.org/linux-patches/epoll_ctl.txt
    http://www.xmailserver.org/linux-patches/epoll_wait.txt




    - Davide


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