From owner-freebsd-fs@FreeBSD.ORG  Sat Sep 22 18:24:27 2012
Return-Path: <owner-freebsd-fs@FreeBSD.ORG>
Delivered-To: freebsd-fs@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 3801D106564A
	for <freebsd-fs@freebsd.org>; Sat, 22 Sep 2012 18:24:27 +0000 (UTC)
	(envelope-from freebsd-listen@fabiankeil.de)
Received: from smtprelay01.ispgateway.de (smtprelay01.ispgateway.de
	[80.67.31.39]) by mx1.freebsd.org (Postfix) with ESMTP id E18418FC08
	for <freebsd-fs@freebsd.org>; Sat, 22 Sep 2012 18:24:26 +0000 (UTC)
Received: from [87.79.193.113] (helo=fabiankeil.de)
	by smtprelay01.ispgateway.de with esmtpsa (SSLv3:AES128-SHA:128)
	(Exim 4.68) (envelope-from <freebsd-listen@fabiankeil.de>)
	id 1TFUNI-00007P-4V
	for freebsd-fs@freebsd.org; Sat, 22 Sep 2012 20:24:20 +0200
Date: Sat, 22 Sep 2012 20:24:14 +0200
From: Fabian Keil <freebsd-listen@fabiankeil.de>
To: freebsd-fs@freebsd.org
Message-ID: <20120922202414.7ed96a21@fabiankeil.de>
In-Reply-To: <20110625134031.3cbc5952@fabiankeil.de>
References: <20110227202957.GD1992@garage.freebsd.pl>
	<20110228192129.119cac0c@r500.local>
	<20110307200634.3c0f92df@r500.local>
	<20110307202531.2c90ff5a@r500.local>
	<20110625134031.3cbc5952@fabiankeil.de>
Mime-Version: 1.0
Content-Type: multipart/signed; micalg=PGP-SHA1;
	boundary="Sig_/cewI3g88P4=WQ__Y4mACAgb";
	protocol="application/pgp-signature"
X-Df-Sender: Nzc1MDY3
Subject: Re: g_wither_washer() called 470000 times per second
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Filesystems <freebsd-fs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
	<mailto:freebsd-fs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-fs>
List-Post: <mailto:freebsd-fs@freebsd.org>
List-Help: <mailto:freebsd-fs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
	<mailto:freebsd-fs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 22 Sep 2012 18:24:27 -0000

--Sig_/cewI3g88P4=WQ__Y4mACAgb
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: quoted-printable

Fabian Keil <freebsd-listen@fabiankeil.de> wrote:

> Apparently what's eating the cpu is the kernel calling
> g_wither_washer() about 470000 time per second which
> seems a bit excessive:
>=20
> r500# dtrace -n 'fbt:kernel:g_*:entry { @[probefunc, stack()] =3D count()=
; } tick-1sec { trunc(@, 15); printa(@); trunc(@)}'
> dtrace: description 'fbt:kernel:g_*:entry ' matched 232 probes
> CPU     ID                    FUNCTION:NAME
> [...]

>   g_wither_washer                                  =20
>               kernel`g_run_events+0x358
>               kernel`fork_exit+0x11f
>               kernel`0xffffffff808debde
>            475959
>=20

This is now kern/171865:
http://www.freebsd.org/cgi/query-pr.cgi?pr=3D171865

Fabian

--Sig_/cewI3g88P4=WQ__Y4mACAgb
Content-Type: application/pgp-signature; name=signature.asc
Content-Disposition: attachment; filename=signature.asc

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.19 (FreeBSD)

iEYEARECAAYFAlBeAlQACgkQBYqIVf93VJ3z0gCdFKfwM97OYGIOvd+RHr++LyyZ
6BwAn0FfFyF35ycj5jYwT2nsqlhqrEyC
=0kU6
-----END PGP SIGNATURE-----

--Sig_/cewI3g88P4=WQ__Y4mACAgb--