Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758878Ab0FPLv1 (ORCPT ); Wed, 16 Jun 2010 07:51:27 -0400 Received: from hera.kernel.org ([140.211.167.34]:52724 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754168Ab0FPLv0 (ORCPT ); Wed, 16 Jun 2010 07:51:26 -0400 Message-ID: <4C18BABC.8090301@kernel.org> Date: Wed, 16 Jun 2010 13:51:24 +0200 From: Tejun Heo User-Agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.9.1.9) Gecko/20100317 Thunderbird/3.0.4 MIME-Version: 1.0 To: linux-kernel@vger.kernel.org CC: linux-ide@vger.kernel.org Subject: Re: Very slow disk speed after "IRQ: nobody cared" References: <20100615092818.GF1635@myhost.felk.cvut.cz> In-Reply-To: <20100615092818.GF1635@myhost.felk.cvut.cz> X-Enigmail-Version: 1.0.1 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.3 (hera.kernel.org [127.0.0.1]); Wed, 16 Jun 2010 11:51:25 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2818 Lines: 63 (cc'ing linux-ide) On 06/15/2010 11:28 AM, Michal Svoboda wrote: > Hello list, > > Sometimes I get a 'nobody cared' message such as this > > [ 202.078556] irq 16: nobody cared (try booting with the "irqpoll" option) > [ 202.078561] Pid: 0, comm: swapper Not tainted 2.6.33 #1 > [ 202.078563] Call Trace: > [ 202.078565] [] __report_bad_irq+0x26/0xa0 > [ 202.078574] [] note_interrupt+0x18a/0x1d0 > [ 202.078578] [] ? handle_IRQ_event+0x4a/0xf0 > [ 202.078582] [] handle_fasteoi_irq+0xcd/0x100 > [ 202.078587] [] handle_irq+0x1d/0x30 > [ 202.078590] [] do_IRQ+0x67/0xf0 > [ 202.078595] [] ret_from_intr+0x0/0xa > [ 202.078597] [] ? acpi_idle_enter_bm+0x224/0x24d > [ 202.078606] [] ? acpi_idle_enter_bm+0x21a/0x24d > [ 202.078611] [] cpuidle_idle_call+0x9b/0x100 > [ 202.078615] [] cpu_idle+0x9c/0xf0 > [ 202.078618] [] ? kernel_thread_helper+0x0/0x10 > [ 202.078624] [] rest_init+0x8f/0xa0 > [ 202.078628] [] start_kernel+0x322/0x32d > [ 202.078632] [] x86_64_start_reservations+0xf7/0xfb > [ 202.078636] [] x86_64_start_kernel+0xe8/0xef > [ 202.078638] handlers: > [ 202.078639] [] (mpt_interrupt+0x0/0x990) > [ 202.078645] [] (usb_hcd_irq+0x0/0x70) > [ 202.078649] Disabling IRQ #16 > > And then my disks go turtle speed: > /dev/sda: > Timing cached reads: 9180 MB in 2.00 seconds = 4591.89 MB/sec > Timing buffered disk reads: 8 MB in 3.20 seconds = 2.50 MB/sec > > IRQ 16 seems to have something to do with disks: > [ 19.703064] scsi6 : ioc0: LSISAS1068E B3, FwRev=00192f00h, Ports=1, > MaxQ=266, IRQ=16 > CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 > CPU6 CPU7 > 16: 200124 0 0 0 0 0 > 0 0 IO-APIC-fasteoi ioc0, uhci_hcd:usb3 > > Is the performance drop caused by the 'disabling IRQ'? And why would > the 'nobody cared' message be printed in the first place (it happens > only sometimes)? And is there a way out of this (ie. enabling the IRQ) > besides rebooting? Can you please post full boot log? Also, can you give a shot at the following git tree? git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git lost-spurious-irq Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/