[lkml]   [2003]   [Nov]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    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
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 13:58    [W:0.022 / U:8.228 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site