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    SubjectRe: regression: 100% io-wait with 2.6.24-rcX
    Date
    Am Mittwoch, 9. Januar 2008 schrieb Fengguang Wu:
    > On Wed, Jan 09, 2008 at 01:22:33PM +0100, Joerg Platte wrote:
    > > Am Mittwoch, 9. Januar 2008 schrieb Fengguang Wu:
    > >
    > > Thank your for the hint with the filesystems!
    > >
    > > > Thank you for the clue. However I cannot reproduce the bug on
    > > > ext2/2.6.24-rc7. Can you provide more details? Thank you.
    > >
    > > I attached some more information. I'm using the ata_piix driver for my
    > > PATA disk and cdrom drive and booted with hpet=force. Kernel 2.6.23.X has
    > > been
    >
    > ~~~~~~~~
    > not 2.6.24-rc7?
    >
    No, 2.6.23.X was the last working kernel without this problem, the bug shows
    up with 2.6.24-rcX. I just wanted to emphasis, that I don't think that it has
    something to do with the hpet stuff. Kernel 2.6.24-rcX is unpatched, because
    the hrt stuff has been merged.

    > > patched with the -hrt patches to enable the hidden hpet time on the
    > > ICH4-M chipset. I just rebooted the notebook and mounted /tmp again as
    > > ext2 and now the iowait problem is back. Seems to be reproducible on my
    > > computer. What additional information do you need?
    >
    > I mounted an ext2 as tmp and find no problem. My config options are:
    >
    > CONFIG_EXT2_FS=y
    > CONFIG_EXT2_FS_XATTR=y
    > CONFIG_EXT2_FS_POSIX_ACL=y
    > CONFIG_EXT2_FS_SECURITY=y
    > # CONFIG_EXT2_FS_XIP is not set
    >
    > Fengguang

    CONFIG_EXT2_FS=m
    CONFIG_EXT2_FS_XATTR=y
    CONFIG_EXT2_FS_POSIX_ACL=y
    CONFIG_EXT2_FS_SECURITY=y
    CONFIG_EXT2_FS_XIP=y

    Here it is modular and I enabled CONFIG_EXT2_FS_XIP, but the same is enabled
    on 2.6.23.X. Maybe it is related to libata? I additionally discovered, that
    the problem disappears for a few seconds when I press the eject button for
    the ultra bay of my thinkpad. Pressing the button unregisters the cdrom drive
    to be able to replace it with a hard drive or a battery. Maybe this bug is
    thinkpad relared?

    regards,
    Jörg

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