Re: 2.6.5-rc1-mm2 and direct_read_under and wb

From: Daniel McNeil (daniel_at_osdl.org)
Date: 03/22/04

  • Next message: Richard Curnow: "Re: can device drivers return non-ram via vm_ops->nopage?" 
    To: Chris Mason <mason@suse.com>, Andrew Morton <akpm@osdl.org>
Date:	22 Mar 2004 10:10:17 -0800

    Andrew and Chris,

    I re-ran the direct_read_under tests over the weekend on ext3 with
    the attached wb_rwsema patch and ran without errors.

    It looks like the same thing as before -- async writebacks are causing
    the sync writebacks to miss pages.

    Thoughts?

    Daniel

    On Sun, 2004-03-21 at 06:36, Chris Mason wrote:
    > On Fri, 2004-03-19 at 12:05, Daniel McNeil wrote:
    > > Can't type this morning -- 2.6.5-rc1-mm2 is what I ran on.
    > > =============
    > >
    > > Daniel
    > > On Fri, 2004-03-19 at 08:49, Daniel McNeil wrote:
    > > > I re-ran direct_read_under test (6 copies) on 2.6.4-rc1-mm2:
    > > >
    > > > ext3 failed within 2 hours.
    > > >
    > > > ext2 ran overnight without errors.
    > > >
    > [ ... a slightly different kernel, but numbers are probably good ]
    >
    > > > >
    > > > > Still have the data:
    > > > > 63 pages (258048 bytes)
    > > > > 90 pages (368640 bytes)
    > > > > 139 pages (569344 bytes)
    > > > > 30 pages (122880 bytes)
    > > > > 87 pages (356352 bytes)
    > > > >
    > > >
    >
    > That seems like a lot of pages for a small race, it feels like we have a
    > bigger problem. If nobody else has ideas, and you've got an available
    > disk for mkreiserfs, could I talk you into trying with reiserfs
    > data=ordered?
    >
    > ftp.suse.com/pub/people/mason/patches/data-logging/experimental/2.6.4
    >
    > (use series.mm for a list of files to apply to 2.6.5-rc-mm)
    >
    > data=ordered is the default with those patches, so just mkreiserfs and
    > mount. reiserfs is using a different writepage and different code to
    > submit the ordered buffers, so you'll be using completely different code
    > paths.
    >
    > I'll try to get some time on an 8way here for some tests as well.
    >
    > -chris
    >

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