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Date:      Sat, 05 Sep 1998 10:11:15 -0700
From:      Mike Smith <mike@smith.net.au>
To:        andrew@squiz.co.nz
Cc:        Tom <tom@uniserve.com>, The Hermit Hacker <scrappy@hub.org>, Bob K <melange@yip.org>, The Lab <thelab@nmarcom.com>, freebsd-stable@FreeBSD.ORG
Subject:   Re: too many open files 
Message-ID:  <199809051711.KAA05862@word.smith.net.au>
In-Reply-To: Your message of "Sun, 06 Sep 1998 01:59:33 %2B1200." <Pine.BSF.3.96.980906015229.4203B-100000@aniwa.sky> 

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> On Fri, 4 Sep 1998, Tom wrote:
> 
> > > 	One requires a rebuild/reboot of the system...one doesn't.  IN a
> > > production environment, /etc/login.conf is about the only choice...
> > 
> >   Except you are talking about two different things.  MAXUSERS controls
> > the system wide file table.  /etc/login.conf controls per-user file
> > limits.  You can increase the limits in /etc/login.conf all you want, but
> > if the system wide table is full, you will still get "too many open files"
> > errors.
> > 
> > Tom
> 
> between sysctl and login.conf, either can be set without a rebuild.

No.  The kern.maxfiles sysctl shouldn't be writable in 2.2, and it's 
not writable in 3.0; it refers to the size of a static table.

> references to MAXUSERS seem to suggest that it affects a whole range of
> values.  Some of it can be overridden via sysctl.  Can anyone clarify what
> if anything can't?  sysctl and ulimit have sorted out my recent problems,
> with  numbers of processes and files, but perhaps there's  other reasons
> why I should increase MAXUSERS?

None of the critical items can be adjusted at runtime; the two critical
items are the maximum number of open files in the system, and the
maximum number of mbuf clusters.

-- 
\\  Sometimes you're ahead,       \\  Mike Smith
\\  sometimes you're behind.      \\  mike@smith.net.au
\\  The race is long, and in the  \\  msmith@freebsd.org
\\  end it's only with yourself.  \\  msmith@cdrom.com



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