From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755269AbYHXKfg (ORCPT ); Sun, 24 Aug 2008 06:35:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752971AbYHXKf1 (ORCPT ); Sun, 24 Aug 2008 06:35:27 -0400 Received: from smtp14.mtu.ru ([62.5.255.60]:49600 "EHLO smtp14.mtu.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752698AbYHXKf0 (ORCPT ); Sun, 24 Aug 2008 06:35:26 -0400 X-Greylist: delayed 526 seconds by postgrey-1.27 at vger.kernel.org; Sun, 24 Aug 2008 06:35:26 EDT From: Andrey Borzenkov To: linux-kernel@vger.kernel.org Subject: What is "extra timer interrupt" in powertop output? Date: Sun, 24 Aug 2008 14:26:33 +0400 User-Agent: KMail/1.10.0 (Linux/2.6.27-rc4-1avb; KDE/4.1.0; i686; ; ) MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart1511446.SVBrXjt2my"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Message-Id: <200808241426.34304.arvidjaar@mail.ru> X-DCC-STREAM-Metrics: smtp14.mtu.ru 10001; Body=0 Fuz1=0 Fuz2=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --nextPart1511446.SVBrXjt2my Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline After disabling CD-ROM polling the next top-100 winner is "extra timer=20 interrupt": Cn Avg residency P-states (frequencies) C0 (cpu running) ( 4.2%) 750 Mhz 0.0% polling 0.0ms ( 0.0%) 500 Mhz 100.0% C1 0.0ms ( 0.0%) C2 0.9ms (95.8%) Wakeups-from-idle per second : 1101.2 interval: 5.0s Power usage (ACPI estimate): 11.7W (2.2 hours) Top causes for wakeups: 31.6% ( 8.4) : extra timer interrupt 15.0% ( 4.0) hald-addon-acpi : schedule_timeout (process_timeout) I assume, this is what is simply called "timer": {pts/1}:~%> cat /proc/interrupts CPU0 0: 9060975 XT-PIC-XT timer 1: 18742 XT-PIC-XT i8042 2: 0 XT-PIC-XT cascade 3: 2 XT-PIC-XT 4: 2 XT-PIC-XT 5: 3 XT-PIC-XT 7: 5 XT-PIC-XT irda0 8: 11 XT-PIC-XT rtc0 9: 3376 XT-PIC-XT acpi 10: 2 XT-PIC-XT 11: 239251 XT-PIC-XT ohci_hcd:usb1, yenta, yenta, yenta, ALI= =20 5451, pcmcia0.0 12: 621206 XT-PIC-XT i8042 14: 225993 XT-PIC-XT ide0 15: 315463 XT-PIC-XT ide1 NMI: 0 Non-maskable interrupts ERR: 0 Any way to find out why there are so many of them? System is using dynamic= =20 ticks: {pts/1}:~/src/linux-git%> grep NO_HZ /boot/config CONFIG_NO_HZ=3Dy TIA =2Dandrey --nextPart1511446.SVBrXjt2my Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEABECAAYFAkixN1oACgkQR6LMutpd94xODACfdxGbx3xelWbnsEenobbmuM8P G1QAoMbg83kNOJjeJwXENziR+zEFj8Ai =B76G -----END PGP SIGNATURE----- --nextPart1511446.SVBrXjt2my--