Messages in this thread | | | Date | Wed, 11 Jul 2001 23:12:58 -0700 (PDT) | From | parviz dey <> | Subject | Re: 2x Oracle slowdown from 2.2.16 to 2.4.4 |
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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 > > - > To unsubscribe from this list: send the line > "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at > http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
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