Date: Fri, 9 Jan 2004 14:24:53 +0100 From: Thorsten Greiner <thorsten@tgreiner.net> To: Andre Oppermann <andre@freebsd.org> Cc: current@freebsd.org Subject: Re: the TCP MSS resource exhaustion commit Message-ID: <20040109132453.GD2031@tybalt.nev.psi.de> In-Reply-To: <3FFE8232.730F70B8@freebsd.org> References: <20040109085522.GB4246@tybalt.nev.psi.de> <3FFE8232.730F70B8@freebsd.org>
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* Andre Oppermann <andre@freebsd.org> [2004-01-09 11:34]:
> You can simply increase net.inet.tcp.minmssoverload to any
> higher value. I suggest 2,000 as next step. If set it to
> 0 the check will be disabled entirely.
Setting net.inet.tcp.minmssoverload to 4000 fixed my problem(s).
> This makes we wonder why the Oracle database server is sending
> so many small packets. Is your JBoss application doing connection
> pooling (eg. multiplexing multiple SQL sessions over one tcp
> session)?
It performs connection pooling on the application layer, i.e. it
opens several connections and pools them to avoid reopening them. As
far as I understand each Oracle connection is associated with a TCP
connection - there is no pooling on the TCP level.
While I have read your commit message thoroughly I am not sure I
have understood the consequences of the new mechanism. Will the
exchange of many small packets trigger a connection drop?
Best regards
-Thorsten
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