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Date:      Tue, 01 Jul 2008 08:10:39 -0400
From:      Coleman Kane <cokane@FreeBSD.org>
To:        Alexander Kabaev <kabaev@gmail.com>
Cc:        vova@fbsd.ru, current@FreeBSD.org, cvs-all@FreeBSD.org
Subject:   Re: [fwd] cvs commit: src/lib/libthr/thread thr_mutex.c thr_umtx.c thr_umtx.h src/sys/kern kern_umtx.c src/sys/sys umtx.h
Message-ID:  <1214914239.1802.31.camel@localhost>
In-Reply-To: <20080701073434.523a72ea@kan.dnsalias.net>
References:  <200806240737.m5O7bhc5018813@repoman.freebsd.org> <1214850524.42354.9.camel@localhost> <20080701104912.5e9e16e0@peedub.jennejohn.org> <1214908172.1947.29.camel@localhost> <20080701073434.523a72ea@kan.dnsalias.net>

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On Tue, 2008-07-01 at 07:34 -0400, Alexander Kabaev wrote:
> On Tue, 01 Jul 2008 14:29:32 +0400
> Vladimir Grebenschikov <vova@fbsd.ru> wrote:
>=20
> > On Tue, 2008-07-01 at 10:49 +0200, Gary Jennejohn wrote:
> > > On Mon, 30 Jun 2008 22:28:44 +0400
> > > Vladimir Grebenschikov <vova@fbsd.ru> wrote:
> > >=20
> > > > On Tue, 2008-06-24 at 07:32 +0000, David Xu wrote:
> > > >=20
> > > > This commit makes threaded application almost unusable on
> > > > 8-CURRENT.
> > > >=20
> > > > Applications eat 100% CPU all the time and works _very_ slowly.
> > > > (top shows several threads for every constantly applications
> > > > eating CPU)
> > > >=20
> > > > Following applications are affected for me: firefox, evolution,
> > > > eclipse (probably more).
> > > >=20
> > > > Reverting user-land part of commit fixes problem, reverting kernel
> > > > changes nothing regarding the problem.
> >=20
> > ...
> >=20
> > > Did you recompile these misbehaving applications?
> > >=20
> > > I ask because I installed a fresh world yesterday, without
> > > recompiling any ports, and I'm _not_ seeing any misbehavior with
> > > firefox.
> >=20
> > Do you have SMP system ?=20
> >=20
> Works fine for me on amd64 SMP and i386 UP systems, world build on June
> 29th on both.
>=20
> Could you ktrace firefox-bin while it spins? Just in case...
>=20

Firefox depends upon a lot of external things, including glib, nss, and
nspr (among others, probably) which would propagate thread-lib bugs even
after the main app has been recompiled. I suggest running ldd
on /usr/local/lib/firefox/firefox-bin (and other shared objects in that
dir) to find out what all you might need to rebuild. At the very least,
I'd expect a rebuild of nspr and nss to be mandatory. I *think* firefox
uses nspr's thread implementation, and not the one from gthread (glib).

--=20
Coleman Kane

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