Re: sendfile(2) SF_NOPUSH flag proposal

From: Terry Lambert (tlambert2_at_mindspring.com)
Date: 05/30/03

  • Next message: Igor Sysoev: "Re: sendfile(2) SF_NOPUSH flag proposal" 
    Date: Fri, 30 May 2003 01:49:29 -0700
To: Igor Sysoev <is@rambler-co.ru>

    Igor Sysoev wrote:
    > > FreeBSD, NetBSD, OpenBSD, Darwin.
    >
    > There's no sendfile() implementation in NetBSD and OpenBSD. If you
    > apply some experimental patch you can easy fix some non-portable issues.

    Or you could just fix sendfile. 8-).

    > By the way what's about kqueue(2) ? Are you not confused that NetBSD
    > does not support EVFILT_AIO and OpenBSD does not support EVFILT_AIO and
    > EVFILT_TIMER ? Does this mean that FreeBSD should not introduce any
    > new kqueue filters or flags ?

    These are incredibly trivial to support. I estimate the work
    at an hour each, including writing a unit test. It took me
    about an hour to write the SystemV IPC Message Queue KNOTE()
    code for FreeBSD.

    > I agree but I told not about the blocking on a page fault but the blocking
    > on the reading the file page from a disk by sendfile(). These pages
    > can be preloaded.

    It doesn't "read" it, per se: it creates a mapping, and it
    faults the pages; when they are in core, then they can be
    sent.

    [ removed 3 tangents not germane to this discussion; if you
      want to revive them, please revive them on -chat ]

    -- Terry
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