Date: Fri, 7 Dec 2001 14:15:50 -0500 From: Bosko Milekic <bmilekic@technokratis.com> To: Robert Watson <rwatson@FreeBSD.ORG> Cc: arch@FreeBSD.ORG Subject: Re: Default value for maxusers Message-ID: <20011207141550.A43932@technokratis.com> In-Reply-To: <Pine.NEB.3.96L.1011207131905.42713G-100000@fledge.watson.org>; from rwatson@FreeBSD.ORG on Fri, Dec 07, 2001 at 01:21:46PM -0500 References: <Pine.NEB.3.96L.1011207131905.42713G-100000@fledge.watson.org>
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On Fri, Dec 07, 2001 at 01:21:46PM -0500, Robert Watson wrote:
>
> While reviewing and updating the content of tuning(7), I noticed the
> following text:
>
> The kern.maxusers tunable defaults to an incredibly low value. For most
> modern machines, you probably want to increase this value to 64, 128, or
Suggestion: increase maxusers, strike those two lines. Replace with
something like:
The kern.maxusers tunable is used to scale a variety of resource
parameters in the kernel. It is used to determine, possibly amongst other
things, the virtual address space allocated to network memory buffers,
the number of file descriptors, and the maximum number of processes.
The default value is <OUR_NEW_DEFAULT>. We do not recommend...
[continue original text below]...
> 256. We do not recommend going above 256 unless you need a huge number
> of file descriptors. Network buffers are also affected but can be
> controlled with a separate kernel option. Do not increase maxusers just
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
I would also add, in parantheses (NMBCLUSTERS).
> to get more network mbufs. Systems older than FreeBSD 4.4 do not have
> this loader tunable and require that the kernel config(8) option maxusers
> be set instead.
Suggestion: Leave this text, it is still relevant.
> The first two sentences suggest that either we need to do one of the
> following:
>
> (1) Update the default maxusers value in GENERIC to something larger
> (perhaps 64), and remove the text from tuning(7), or...
>
> (2) Remove this text from tuning(7).
>
> It seems rediculous to have a default that is known to be inadequate (or
> worse, "incredibly low"). I have to admit that the first thing I do with
> any box is either recompile the kernel to have higher maxusers, or use
> kern.maxusers in /boot/loader.conf to update it to at least 64. If we
> believe the observations above are correct, the choice seems simple:
> update GENERIC, and I'd be happy to commit that to at least -CURRENT, and
> possibly -STABLE. If they're not, we should moderate the description
> above a bit :-).
>
> Robert N M Watson FreeBSD Core Team, TrustedBSD Project
> robert@fledge.watson.org NAI Labs, Safeport Network Services
--
Bosko Milekic
bmilekic@technokratis.com
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