Date: Tue, 6 Dec 2005 10:36:48 -0800 From: John-Mark Gurney <gurney_j@resnet.uoregon.edu> To: Igor Sysoev <is@rambler-co.ru> Cc: freebsd-net@freebsd.org Subject: Re: strange timeout error returned by kevent() in 6.0 Message-ID: <20051206183648.GG55657@funkthat.com> In-Reply-To: <20050901182115.F11484@is.park.rambler.ru> References: <20050901140051.G11484@is.park.rambler.ru> <20050901182115.F11484@is.park.rambler.ru>
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Igor Sysoev wrote this message on Thu, Sep 01, 2005 at 18:26 +0400:
> On Thu, 1 Sep 2005, Igor Sysoev wrote:
>
> >I found strange timeout errors returned by kevent() in 6.0 using
> >my http server named nginx. The nginx's run on three machines:
> >two 4.10-RELEASE and one 6.0-BETA3. All machines serve the same
> >content (simple cluster) and each handles about 200 requests/second.
> >
> >On 6.0 sometimes (2 or 3 times per hour) in the daytime kevent()
> >returns EV_EOF in flags and ETIMEDOUT in fflags, nevertheless:
> >
> >1) nginx does not set any kernel timeout for sockets;
> >2) the total request time for such failed requests is small, 30 and so
> >seconds.
>
> I have changed code to ignore the ETIMEDOUT error returned by kevent()
> and found that subsequent sendfile() returned the ENOTCONN.
>
> By the way, why sendfile() may return ENOTCONN ?
> I saw this error code on 4.x too.
The reason that you are seeing ETIMEDOUT/ENOTCONN is that the connection
probably ETIMEDOUT (aka timed out)... and so is ENOTCONN (no longer
connected).. can you also do a read or a write to the socket successfully?
and sendfile(3) says:
ERRORS
[...]
[ENOTCONN] The s argument points to an unconnected socket.
and a glance at tcp(4) says:
ERRORS
[...]
[ETIMEDOUT] when a connection was dropped due to excessive
retransmissions;
There's the answers...
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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