From: James Cloos Subject: Re: [Regression] Filesystem I/O is CPU-bound in rc7 and rc8 Date: Fri, 19 Feb 2010 16:44:08 -0500 Message-ID: References: <93cdabd21002191322g7ea13d8bk52f1545df913f07@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org, jfs-discussion@lists.sourceforge.net To: Mike Fedyk Return-path: Received: from eagle.jhcloos.com ([207.210.242.212]:35078 "EHLO eagle.jhcloos.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754807Ab0BSVow (ORCPT ); Fri, 19 Feb 2010 16:44:52 -0500 In-Reply-To: <93cdabd21002191322g7ea13d8bk52f1545df913f07@mail.gmail.com> (Mike Fedyk's message of "Fri, 19 Feb 2010 13:22:45 -0800") Sender: linux-ext4-owner@vger.kernel.org List-ID: >>>>> "Mike" =3D=3D Mike Fedyk writes: Mike> On Sat, Feb 13, 2010 at 7:11 PM, James Cloos = wrote: >> Sometime between rc6 and rc7 all filesystem I/O started using 100% C= PU, >> usually on the order of 60% sys, 40% user. >>=20 >> I've tried this with each of ext4, jfs and btrfs filesystems. =A0All= show >> the same issue. >>=20 Mike> Are you sure you're not running with any of the debugging options Mike> enabled? I see the same, but I have debugging enabled (rawhide Mike> kernel). There are some: CONFIG_HAVE_DMA_API_DEBUG=3Dy CONFIG_X86_DEBUGCTLMSR=3Dy CONFIG_CFG80211_DEBUGFS=3Dy CONFIG_MAC80211_DEBUGFS=3Dy CONFIG_PNP_DEBUG_MESSAGES=3Dy CONFIG_FIREWIRE_OHCI_DEBUG=3Dy CONFIG_USB_SERIAL_DEBUG=3Dm CONFIG_DEBUG_FS=3Dy CONFIG_DEBUG_KERNEL=3Dy CONFIG_SCHED_DEBUG=3Dy CONFIG_DEBUG_BUGVERBOSE=3Dy CONFIG_DEBUG_MEMORY_INIT=3Dy CONFIG_DEBUG_STACKOVERFLOW=3Dy CONFIG_KEYS_DEBUG_PROC_KEYS=3Dy I forgot about /proc/sched_debug, but am back at -rc6 right now; I'll post an example of /proc/sched_debug output during the issue when I'm next in rc8 or later. -JimC --=20 James Cloos OpenPGP: 1024D/ED7DAEA6 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html