Date: Thu, 27 Aug 2009 23:20:00 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: Linda Messerschmidt <linda.messerschmidt@gmail.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Intermittent system hangs on 7.2-RELEASE-p1 Message-ID: <20090827202000.GQ9623@deviant.kiev.zoral.com.ua> In-Reply-To: <237c27100908271314v28e6c710s8a278064333d1d20@mail.gmail.com> References: <237c27100908261203g7e771400o2d9603220d1f1e0b@mail.gmail.com> <200908261642.59419.jhb@freebsd.org> <237c27100908271314v28e6c710s8a278064333d1d20@mail.gmail.com>
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--vgR9NaMwtk/oK4d5 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Aug 27, 2009 at 04:14:39PM -0400, Linda Messerschmidt wrote: > On Wed, Aug 26, 2009 at 4:42 PM, John Baldwin<jhb@freebsd.org> wrote: > > One thing to note is that ktrace only logs voluntary context switches (= i.e. > > call to tsleep or waiting on a condition variable). It specifically do= es not > > log preemptions or blocking on a mutex, >=20 > I was not aware, thanks. >=20 > > so in theory if your machine was > > livelocked temporarily that might explain this. >=20 > How would we determine that? >=20 > We are now able to reproduce this on a test machine, even after > slipping in a 7.2-STABLE kernel with KTR enabled. So we have a lot > more options now. >=20 > Unfortunately, I don't really "get" KTR yet. It looks like it has > relevant info, but I was unable to correlate its huge timestamps (e.g. > 6795522404430562) to ktrace output times (e.g. 1251387606.225544) > showing problem areas. >=20 > What's my best bet from here? How much memory is installed ? --vgR9NaMwtk/oK4d5 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (FreeBSD) iEYEARECAAYFAkqW6nAACgkQC3+MBN1Mb4jSAwCgkAqNs76fjgjU8lxUzJkslk/e qmEAn3nPACrDtWMffwx47nUEAS1EtI7X =lY55 -----END PGP SIGNATURE----- --vgR9NaMwtk/oK4d5--
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