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We discuss increasing NMBCLUSTERS in the Handbook.

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Don't have separate, old instructions in the FAQ, point to the
authoritative Handbook instead.
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Michael Lucas 2005-05-12 20:55:55 +00:00
parent 1a44e592e9
commit dd193d1279
Notes: svn2git 2020-12-08 03:00:23 +00:00 
svn path=/head/; revision=24562
1 changed files with 3 additions and 13 deletions

16
en_US.ISO8859-1/books/faq/book.sgml
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@ -3284,19 +3284,9 @@ quit</programlisting>
<para>The panic indicates that the system ran out of virtual
memory for network buffers (specifically, mbuf clusters). You
can increase the amount of VM available for mbuf clusters by
adding:</para>
<para><literal>options NMBCLUSTERS=<replaceable>n</replaceable></literal></para>
<para>to your kernel config file, where
<replaceable>n</replaceable> is a number in the range
512-4096, depending on the number of concurrent TCP
connections you need to support. We recommend trying
2048 - this should get rid of the panic completely. You
can monitor the number of mbuf clusters allocated/in use
on the system with <command>netstat -m</command> (see
&man.netstat.1;). The default value for NMBCLUSTERS is
<literal>1024 + MAXUSERS * 64</literal>.</para>
following the instructions in the <ulink
url="&url.books.handbook;/configtuning-kernel-limits.html#NMBCLUSTERS">Network
Limits</ulink> section of the Handbook.</para>
</answer>
</qandaentry>