From owner-freebsd-net@FreeBSD.ORG  Thu Sep  1 14:26:07 2005
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Date: Thu, 1 Sep 2005 18:26:03 +0400 (MSD)
From: Igor Sysoev <is@rambler-co.ru>
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Subject: Re: strange timeout error returned by kevent() in 6.0
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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.


Igor Sysoev
http://sysoev.ru/en/