Date: Fri, 10 Jan 2003 19:46:49 -0800 From: Peter Wemm <peter@wemm.org> To: Tim Robbins <tjr@FreeBSD.org> Cc: Juli Mallett <jmallett@FreeBSD.org>, current@FreeBSD.org Subject: Re: Serious issues with kqueue on sockets on CURRENT. Message-ID: <20030111034649.6A35D2A89E@canning.wemm.org> In-Reply-To: <20030110215736.A31727@dilbert.robbins.dropbear.id.au>
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Tim Robbins wrote:
> On Fri, Jan 10, 2003 at 01:30:16AM -0800, Juli Mallett wrote:
>
> > Lately, the data field for sockets, which holds bytes ready (in the EVFILT_
> > READ case) to be read, is computed to be zero. This means that if you have
> > a low watermark which is >0 per the kq, THE EVENT WILL NEVER HAPPEN. Not t
o
> > mention that this means when the event IS triggered properly (if you can
> > call it that), it is always said to have =ZERO= bytes ready.
> [...]
>
> I can definitely reproduce this here and also fairly angry about it.
> In addition to what you mentioned, fstat() gives an incorrect st_size
> result now and it's likely that non-NOTE_LOWAT low watermarks are
> firing too early as well.
>
> Ugly test program @ http://people.freebsd.org/~tjr/kq.c
In case anybody wants to play, I seem to recall some changes in uipc_socket.c
that caused some problems (totally hosed the resolver) a while back:
----------------------------
revision 1.134
date: 2002/11/01 21:27:59; author: kbyanc; state: Exp; lines: +1 -1
Track the number of non-data chararacters stored in socket buffers so that
the data value returned by kevent()'s EVFILT_READ filter on non-TCP
sockets accurately reflects the amount of data that can be read from the
sockets by applications.
PR: 30634
Reviewed by: -net, -arch
Sponsored by: NTT Multimedia Communications Labs
MFC after: 2 weeks
----------------------------
revision 1.136
date: 2002/11/05 18:48:46; author: kbyanc; state: Exp; lines: +1 -1
Fix filt_soread() to properly flag a kevent when a 0-byte datagram is
received.
Verified by: dougb, Manfred Antar <null@pozo.com>
Sponsored by: NTT Multimedia Communications Labs
----------------------------
Is this related?
Cheers,
-Peter
--
Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com
"All of this is for nothing if we don't go to the stars" - JMS/B5
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