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    SubjectRe: 2.6.5-rc3-mm4
    markw@osdl.org wrote:
    >
    > I reran DBT-2 to with ext2 and ext3 (in case you were still interested)
    > on my 4-way Xeon system with 60+ drives:
    > http://developer.osdl.org/markw/fs/dbt2_project_results.html
    >
    > Aside from the from the drop you're already aware of since 2.6.3, it
    > looks like DBT-2 takes another smaller hit after 2.6.5-rc3-mm2. Here's
    > a brief summary from the link above:

    The profile is interesting:

    3671973 poll_idle 63309.8793
    77750 __copy_from_user_ll 637.2951
    64788 generic_unplug_device 487.1278
    62968 DAC960_LP_InterruptHandler 336.7273
    53908 finish_task_switch 361.7987
    52947 __copy_to_user_ll 441.2250
    29419 dm_table_unplug_all 439.0896
    25947 __make_request 17.9938
    18564 dm_table_any_congested 199.6129
    13785 update_queue 104.4318
    13498 try_to_wake_up 20.3590
    12736 __wake_up 114.7387
    12560 kmem_cache_alloc 163.1169
    12221 .text.lock.sched 40.7367

    - There's a ton of idle time there.

    - The CPU scheduler is hurting. Nick and Ingo are patching up a storm to
    fix a similar problem which Jeremy Higdon is observing at 200,000
    IOs/sec. This will get better.

    - That 60-disk LVM array is costing us in the new unplug and congestion
    code. Jens, didn't you have a tune-up for that in the works?

    - I'm surprised that you didn't see big gains from ext3-fsync-speedup,
    even though it appears that the test uses fdatasync().

    -
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