Date: Thu, 29 May 2003 09:22:54 +0400 (MSD) From: Igor Sysoev <is@rambler-co.ru> To: Terry Lambert <tlambert2@mindspring.com> Cc: arch@freebsd.org Subject: Re: sendfile(2) SF_NOPUSH flag proposal Message-ID: <Pine.BSF.4.21.0305290922350.51958-100000@is> In-Reply-To: <3ED5961E.5DE0F41B@mindspring.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wed, 28 May 2003, Terry Lambert wrote:
> 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.
But as I understand PRUS_MORETOCOME is not set if socket is non-blocking.
Igor Sysoev
http://sysoev.ru/en/
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSF.4.21.0305290922350.51958-100000>