diff options
| -rw-r--r-- | release/doc/en_US.ISO8859-1/relnotes/article.sgml | 12 | ||||
| -rw-r--r-- | release/doc/en_US.ISO8859-1/relnotes/common/new.sgml | 12 |
2 files changed, 22 insertions, 2 deletions
diff --git a/release/doc/en_US.ISO8859-1/relnotes/article.sgml b/release/doc/en_US.ISO8859-1/relnotes/article.sgml index 27c2ebb4d226..37ff2140159c 100644 --- a/release/doc/en_US.ISO8859-1/relnotes/article.sgml +++ b/release/doc/en_US.ISO8859-1/relnotes/article.sgml @@ -803,7 +803,17 @@ options HZ=1000 # not compulsory but strongly recommended</programlisting> default for both buffer sizes was 16K. To try to avoid increasing congestion, the default value for <varname>net.inet.tcp.local_slowstart_flightsize</varname> has - been changed from infinity to 4. &merged;</para> + been changed from infinity to 4. &merged; + <note> + <para>On busy hosts, the new larger buffer sizes may require + manually increasing the + <varname>NMBCLUSTERS</varname> parameter, either in the + kernel configuration file or via the + <varname>kern.ipc.nmbclusters</varname> loader tunable. + <command>netstat -mb</command> can be used to monitor the + state of mbuf clusters.</para> + </note> + </para> <para>TCP now supports RFC 1948 (Defending Against Sequence Number Attacks). This functionality is controlled by the diff --git a/release/doc/en_US.ISO8859-1/relnotes/common/new.sgml b/release/doc/en_US.ISO8859-1/relnotes/common/new.sgml index 27c2ebb4d226..37ff2140159c 100644 --- a/release/doc/en_US.ISO8859-1/relnotes/common/new.sgml +++ b/release/doc/en_US.ISO8859-1/relnotes/common/new.sgml @@ -803,7 +803,17 @@ options HZ=1000 # not compulsory but strongly recommended</programlisting> default for both buffer sizes was 16K. To try to avoid increasing congestion, the default value for <varname>net.inet.tcp.local_slowstart_flightsize</varname> has - been changed from infinity to 4. &merged;</para> + been changed from infinity to 4. &merged; + <note> + <para>On busy hosts, the new larger buffer sizes may require + manually increasing the + <varname>NMBCLUSTERS</varname> parameter, either in the + kernel configuration file or via the + <varname>kern.ipc.nmbclusters</varname> loader tunable. + <command>netstat -mb</command> can be used to monitor the + state of mbuf clusters.</para> + </note> + </para> <para>TCP now supports RFC 1948 (Defending Against Sequence Number Attacks). This functionality is controlled by the |