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Date:      Fri, 02 Oct 2009 15:20:41 -0400
From:      Skip Ford <skip@menantico.com>
To:        Igor Sysoev <is@rambler-co.ru>
Cc:        freebsd-net@freebsd.org
Subject:   Re: stuck TIME_WAIT sockets
Message-ID:  <20091002192041.GB1168@menantico.com>
In-Reply-To: <20091002182927.GA63007@rambler-co.ru>
References:  <20091002130646.GC89571@rambler-co.ru> <20091002180621.GA1168@menantico.com> <20091002182927.GA63007@rambler-co.ru>

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Igor Sysoev wrote:
> On Fri, Oct 02, 2009 at 02:06:21PM -0400, Skip Ford wrote:
> > Igor Sysoev wrote:
> > > The TIME_WAIT sockets suddenly started to grow on a host running
> > > FreeBSD 7.2-STABLE, date=2009.09.06.23.59.59
> > > Usually there are 3,000-5,000 TIME_WAIT sockets on the host.
> > > However, today they stared to grow, have reached 110,000 sockets in hour
> > > and still remain on this level.
> > > net.inet.tcp.msl is 30000.
> > > The host uptime is 24 days, 21:53.
> > 
> > Perhaps you need this patch?
> > 
> > Author: peter
> > Date: Thu Aug 20 22:53:28 2009
> > New Revision: 196410
> > URL: http://svn.freebsd.org/changeset/base/196410
> > 
> > Log:
> >   Fix signed comparison bug when ticks goes negative after 24 days of
> >   uptime.  This causes the tcp time_wait state code to fail to expire
> >   sockets in timewait state.
> > 
> >   Approved by:	re (kensmith)
> > 
> > Modified:
> >   head/sys/netinet/tcp_timewait.c
> 
> Thank you.

You're welcome.  There've been quite a few ticks-related commits
lately, so you might need some of those before this one.  Also, there's
no 'MFC after' with this commit, which would worry me a little if I were
you applying it to 7.2.

Seems like a simple fix for a problem you appear to be hitting, however.

-- 
Skip



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