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    SubjectRe: ext3 performance inconsistencies, 2.4/2.6
    On Tue, Nov 04, 2003 at 11:36:55AM -0800, Linus Torvalds wrote:
    > > I've been running bonnie++ filesystems testing on an IBM x335 server
    > > recently. This box uses the MPT RAID controller, but I've disabled the
    > > RAID and am addressing the disks individually. I'm getting wildly
    > > different results between 2.4.20-20-9 (RedHat mod), 2.4.22 (stock), and
    > > 2.6.0-test9.
    > Interesting. The 2.4.22 sequential "per char" results are totally out of
    > line with anything else.
    > The thing is, the overhead for the per-char stuff really should be almost
    > all in user space unless I'm mistaken. It's just using getch/putch, no?

    Unless bonnie++ is using the _unlocked() variants, it might be an issue of
    the mutex overhead from NPTL v. LinuxThreads. Red Hat 9 has its share
    of NPTL bugs.

    It is probably worth rerunning the tests with LD_ASSUME_KERNEL=2.4.1 on
    the Red Hat kernel.


    Bill Rugolsky
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