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    SubjectRe: [Regression] Filesystem I/O is CPU-bound in rc7 and rc8
    Date
    >>>>> "Mike" == Mike Fedyk <mfedyk@mikefedyk.com> writes:

    Mike> On Sat, Feb 13, 2010 at 7:11 PM, James Cloos <cloos@jhcloos.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@jhcloos.com> OpenPGP: 1024D/ED7DAEA6
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