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To: Thomas Seck <tmseck@netcologne.de>
Cc: stable@FreeBSD.ORG, dillon@apollo.backplane.com
Subject: Re: what's vnlru? 
In-reply-to: <20020119132902.GB676@laurel.seck.home> 
References: <200201151618468.SM01176@141.com> <200201160101.g0G117r64693@apollo.backplane.com> <20020116104904.A2800@shikima.mine.nu> <20020116135318.GA427@laurel.seck.home> <200201190102.g0J12MF37253@apollo.backplane.com> <20020119132902.GB676@laurel.seck.home>
Comments: In-reply-to Thomas Seck <tmseck@netcologne.de>
   message dated "Sat, 19 Jan 2002 14:29:02 +0100."
From: "Bruce A. Mah" <bmah@FreeBSD.ORG>
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Date: Sat, 19 Jan 2002 05:43:37 -0800
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If memory serves me right, Thomas Seck wrote:

[snip]

> > +    <para>The kernel now enforces the kern.maxvnodes limit with
> > +    a new kernel process called <literal>vnlru</literal>.  The
> > +    code typically only needs to do work on large-memory systems
> > +    which access lots of tiny files and prevents us from overflowing
> > +    the kernel malloc hoppers for vnodes or inodes.</para>

[snip]

> Hmm, this sounds like one can turn it on or off (which is not the
> case, right?) and people then tend to ask how to do it. How about
> rewording the second sentence into something like "This code prevents
> the system from overflowing the kernel malloc hoppers for vnodes or
> inodes when a large number of small files are accessed on large memory
> systems"? (Please apply grammar fixes as needed, apologies for my german
> high-school english).

So...here's what I already committed a day or two ago to the release 
notes for both CURRENT and 4-STABLE...

    <para>The <varname>kern.maxvnodes</varname> limit now properly
    limits the number of vnodes in use.  Previously only vnodes with
    no cached pages could be freed; this could allow the number of
    vnodes to grow without limit on large-memory machines accessing
    many small files.  A <literal>vnlru</literal> kernel thread helps
    to flush and reuse vnodes.</para>

Matt...if you'd like me to replace this with what you wrote or make 
changes, just give me a yell.

Bruce.



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