Date: Sat, 19 Jan 2002 05:43:37 -0800 From: "Bruce A. Mah" <bmah@FreeBSD.ORG> To: Thomas Seck <tmseck@netcologne.de> Cc: stable@FreeBSD.ORG, dillon@apollo.backplane.com Subject: Re: what's vnlru? Message-ID: <200201191343.g0JDhbN72777@bmah.dyndns.org> 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>
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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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