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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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