Date: Wed, 28 May 2003 22:09:50 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Bill Fenner <fenner@research.att.com> Cc: arch@freebsd.org Subject: Re: sendfile(2) SF_NOPUSH flag proposal Message-ID: <3ED5961E.5DE0F41B@mindspring.com> References: <200305281755.h4SHtbu05504@windsor.research.att.com>
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Bill Fenner wrote:
> Why not set PRUS_MORETOCOME on all but the final pru_send() call?
If the file is larger than `sysctl net.inet.tcp.sendspace`, then
this code in do_sendfile():
if (sbspace(&so->so_snd) < so->so_snd.sb_lowat) {
if (so->so_state & SS_NBIO) {
m_freem(m);
sbunlock(&so->so_snd);
splx(s);
error = EAGAIN;
goto done;
}
error = sbwait(&so->so_snd);
will result in you sleeping with PRUS_MORETOCOME set, but with
no more being sent because the send buffer doesn't get emptied,
as it's waiting for more data to send.
-- Terry
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