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Date: Sun, 29 Oct 2000 11:45:49 -0800 (PST)
From: dean gaudet <dean-list-linux-kernel@arctic.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
cc: Andrew Morton <andrewm@uow.edu.au>, kumon@flab.fujitsu.co.jp,
        Andi Kleen <ak@suse.de>, Alexander Viro <viro@math.psu.edu>,
        "Jeff V. Merkey" <jmerkey@timpanogas.org>,
        Rik van Riel <riel@conectiva.com.br>, linux-kernel@vger.kernel.org,
        Olaf Kirch <okir@monad.swb.de>
Subject: Re: [PATCH] Re: Negative scalability by removal of lock_kernel()?(Was:
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On Sat, 28 Oct 2000, Alan Cox wrote:

> > The big question is: why is Apache using file locking so
> > much?  Is this normal behaviour for Apache?
> 
> Apache uses file locking to serialize accept on hosts where accept either has
> bad thundering heard problems or was simply broken with multiple acceptors

if apache 1.3 is compiled with -DSINGLE_LISTEN_UNSERIALIZED_ACCEPT it'll
avoid the fcntl() serialisation when there is only one listening port.  
(it still uses it for multiple listeners... you can read all about my
logic for that at <http://www.apache.org/docs/misc/perf-tuning.html>.)

is it appropriate for this to be defined for newer linux kernels?  i
haven't kept track, sorry.  tell me what versions to conditionalize it on.

-dean

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