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Message-ID: <m3r5ognbnj.fsf@lugabout.jhcloos.org> Date: Fri, 19 Feb 2010 16:44:08 -0500 From: James Cloos <cloos@...loos.com> To: Mike Fedyk <mfedyk@...efedyk.com> Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org, linux-btrfs@...r.kernel.org, jfs-discussion@...ts.sourceforge.net Subject: Re: [Regression] Filesystem I/O is CPU-bound in rc7 and rc8 >>>>> "Mike" == Mike Fedyk <mfedyk@...efedyk.com> writes: Mike> On Sat, Feb 13, 2010 at 7:11 PM, James Cloos <cloos@...loos.com> wrote: >> Sometime between rc6 and rc7 all filesystem I/O started using 100% CPU, >> usually on the order of 60% sys, 40% user. >> >> I've tried this with each of ext4, jfs and btrfs filesystems. All show >> the same issue. >> 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=y CONFIG_X86_DEBUGCTLMSR=y CONFIG_CFG80211_DEBUGFS=y CONFIG_MAC80211_DEBUGFS=y CONFIG_PNP_DEBUG_MESSAGES=y CONFIG_FIREWIRE_OHCI_DEBUG=y CONFIG_USB_SERIAL_DEBUG=m CONFIG_DEBUG_FS=y CONFIG_DEBUG_KERNEL=y CONFIG_SCHED_DEBUG=y CONFIG_DEBUG_BUGVERBOSE=y CONFIG_DEBUG_MEMORY_INIT=y CONFIG_DEBUG_STACKOVERFLOW=y CONFIG_KEYS_DEBUG_PROC_KEYS=y 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 -- James Cloos <cloos@...loos.com> OpenPGP: 1024D/ED7DAEA6 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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