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    SubjectRe: 2x Oracle slowdown from 2.2.16 to 2.4.4
    Hey Lance,

    interesting stuff!!
    Did u ever found out why this would happen??
    any idea??

    --- Lance Larsh <llarsh@oracle.com> wrote:
    > On Wed, 11 Jul 2001, Brian Strand wrote:
    >
    > > Our Oracle configuration is on reiserfs on lvm on
    > Mylex.
    >
    > I can pretty much tell you it's the reiser+lvm
    > combination that is hurting
    > you here. At the 2.5 kernel summit a few months
    > back, I reported that
    > some of our servers experienced as much as 10-15x
    > slowdown after we moved
    > to 2.4. As it turned out, the problem was that the
    > new servers (with
    > identical hardware to the old servers) were
    > configured to use reiser+lvm,
    > whereas the older servers were using ext2 without
    > lvm. When we rebuilt
    > the new servers with ext2 alone, the problem
    > disappeared. (Note that we
    > also tried reiserfs without lvm, which was 5-6x
    > slower than ext2 without
    > lvm.)
    >
    > I ran lots of iozone tests which illustrated a huge
    > difference in write
    > throughput between reiser and ext2. Chris Mason
    > sent me a patch which
    > improved the reiser case (removing an unnecessary
    > commit), but it was
    > still noticeably slower than ext2. Therefore I
    > would recommend that
    > at this time reiser should not be used for Oracle
    > database files.
    >
    > Thanks,
    > Lance
    >
    > -
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