From owner-freebsd-current@FreeBSD.ORG Sun Jul 18 19:41:18 2010 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 00E201065677; Sun, 18 Jul 2010 19:41:18 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from mail.zoral.com.ua (mx0.zoral.com.ua [91.193.166.200]) by mx1.freebsd.org (Postfix) with ESMTP id 662A28FC0C; Sun, 18 Jul 2010 19:41:16 +0000 (UTC) Received: from deviant.kiev.zoral.com.ua (root@deviant.kiev.zoral.com.ua [10.1.1.148]) by mail.zoral.com.ua (8.14.2/8.14.2) with ESMTP id o6IJf99o053534 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sun, 18 Jul 2010 22:41:09 +0300 (EEST) (envelope-from kostikbel@gmail.com) Received: from deviant.kiev.zoral.com.ua (kostik@localhost [127.0.0.1]) by deviant.kiev.zoral.com.ua (8.14.4/8.14.4) with ESMTP id o6IJf96V029318; Sun, 18 Jul 2010 22:41:09 +0300 (EEST) (envelope-from kostikbel@gmail.com) Received: (from kostik@localhost) by deviant.kiev.zoral.com.ua (8.14.4/8.14.4/Submit) id o6IJf92o029317; Sun, 18 Jul 2010 22:41:09 +0300 (EEST) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: deviant.kiev.zoral.com.ua: kostik set sender to kostikbel@gmail.com using -f Date: Sun, 18 Jul 2010 22:41:09 +0300 From: Kostik Belousov To: Doug Barton Message-ID: <20100718194109.GU2381@deviant.kiev.zoral.com.ua> References: <20100717192128.GM2381@deviant.kiev.zoral.com.ua> <20100718103003.GO2381@deviant.kiev.zoral.com.ua> <4C43541C.3060101@FreeBSD.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="Fh5LqGQwq8YwuKb/" Content-Disposition: inline In-Reply-To: <4C43541C.3060101@FreeBSD.org> User-Agent: Mutt/1.4.2.3i X-Virus-Scanned: clamav-milter 0.95.2 at skuns.kiev.zoral.com.ua X-Virus-Status: Clean X-Spam-Status: No, score=-2.2 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_50, DNS_FROM_OPENWHOIS autolearn=no version=3.2.5 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on skuns.kiev.zoral.com.ua Cc: freebsd-current@freebsd.org, Rui Paulo Subject: Re: Why is intr taking up so much cpu? X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 18 Jul 2010 19:41:18 -0000 --Fh5LqGQwq8YwuKb/ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, Jul 18, 2010 at 12:21:00PM -0700, Doug Barton wrote: > On 07/18/10 03:30, Kostik Belousov wrote: > > On Sun, Jul 18, 2010 at 01:14:41AM -0700, Doug Barton wrote: > >> On Sat, 17 Jul 2010, Kostik Belousov wrote: > >> > >>> Run top in the mode where all system threads are shown separately > >>> (e.g. top -HS seems to do it), then watch what thread eats the proces= sor. > >> > >> And the winner is! > >> > >> 11 root -32 - 0K 168K WAIT 0 0:28 18.02% {swi4:= =20 > >> clock} > >> 11 root 21 -64 - 0K 168K WAIT 0 1:17 18.90% intr > >> > >> The first is with -H, the second without. > > > > Most likely it is some callout handling. Just in case, do you have > > console screensaver active ? >=20 > I assume you mean "saver=3Dyes" in rc.conf, and the answer is no, I am not > using that. Usually I run xscreensaver, but at the time this happened I > was not. I do have DPMS enabled in my X config though. >=20 > Any suggestions on how to dig deeper on this? Are there any settings I > can twiddle to try and mitigate it? When intr time starts accumulating again, try to do "procstat -kk " and correlate the clock thread tid with the backtrace. Might be, it helps to guess what callouts are eating the CPU. --Fh5LqGQwq8YwuKb/ Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (FreeBSD) iEYEARECAAYFAkxDWNUACgkQC3+MBN1Mb4heCACfbleQu3vugDcaJP9F7TFUlzSM Gq8AoPGaORB+Ed1MIqxiSSilYND2uH2q =Yglp -----END PGP SIGNATURE----- --Fh5LqGQwq8YwuKb/--