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Date:      Thu, 12 Sep 2013 22:17:11 +0400
From:      Gleb Smirnoff <glebius@FreeBSD.org>
To:        hiren panchasara <hiren.panchasara@gmail.com>
Cc:        freebsd-current <freebsd-current@freebsd.org>
Subject:   Re: Intermittent hangs in vmem_periodic()
Message-ID:  <20130912181711.GI4574@glebius.int.ru>
In-Reply-To: <CALCpEUHp81UCpFRfytd03iOrY1UT4M5ttMWkGuywVLr9sT6e7Q@mail.gmail.com>
References:  <CALCpEUGherrJbmW9PBO7kSQk1Gj4zigGvvsRiyAwjk-USOXTUw@mail.gmail.com> <20130912092737.GC4574@FreeBSD.org> <CALCpEUGiAh_t-VPkQnU0wyUpEy7mqrLFfSNv_b5pdMg8ednAMw@mail.gmail.com> <CALCpEUHp81UCpFRfytd03iOrY1UT4M5ttMWkGuywVLr9sT6e7Q@mail.gmail.com>

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On Thu, Sep 12, 2013 at 09:31:17AM -0700, hiren panchasara wrote:
h> > > h> PMC: [INSTR_RETIRED_ANY] Samples: 117647 (100.0%) , 6885 unresolved
h> > > h>
h> > > h> %SAMP CALLTREE
h> > > h>  75.9 fork_exit@kernel taskqueue_thread_loop taskqueue_run_locked
h> > > h> vmem_periodic(75.9%)
h> > >
h> > > You probably got DIAGNOSTIC in your kernel config.
h> >
h> > Yes. And I've always had that. Never been a problem before. What has
h> > changed?
h> >
h> 
h> Thanks Gleb.
h> I've removed DIAGNOSTIC and the problem is gone now.
h> 
h> But the way system was behaving with DIAGNOSTIC, its unusable.

Please report that to Jeff. With DIAGNOSTIC the system can be slower,
more chatty on console, but should be usable.

-- 
Totus tuus, Glebius.



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