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    SubjectRe: 2.5.18 / ext3 / oracle trouble
    Zlatko Calusic wrote:
    > Zlatko Calusic <> writes:
    > >
    > > Obviously I need to perform tests on ext2 with swap load, and repeat
    > > them few times. Will do this evening (it takes some time to recover a
    > > database after a corruption, so it's slightly time consuming).
    > >
    > And I did get some interesting results. :)
    > I found a great test case, rebuilding database after corruption. :)
    > It consists of recreation of all tablespaces, initializing data
    > dictionary and finally importing useful data. The whole process takes
    > between 11 and 14 minutes, depending on the type of FS. It's write
    > intensive workload and induces some paging even with 768 MB RAM I
    > have. Did I forgot to say that all this is on a SMP machine, dual
    > PIII? It might matter.
    > And you know what, corruption doesn't depend on the type of FS. It
    > happens on both ext2 & ext3. It's just more likely to see it when
    > running on ext3.
    > Anyway, I managed to pinpoint the problem, it's paging that's the
    > culprit. When I turned off my swap partition (swapoff -a), rebuild
    > went correctly. So I was right, swapping will get you in
    > trouble.

    Thanks. I'll cook up a test for that.

    > I also tried to push the machine harder into swap, with artificial
    > load (typical malloc() in the loop), and it locked up hard after some
    > time (minute or two).
    > And during one of the tests on ext3, when machine actually survived,
    > just after exiting X I had a welcome message waiting, saying something
    > like this:
    > Assertion failure: journal_dirty_metadata() at transaction.c:1146
    > "jh->b_frozen_data == 0"

    I've seen them under load with data=journal. Were you using data=journal
    at the time?

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