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    SubjectRe: OSDL DBT-2 AS vs. Deadline 2.6.0-test4-mm3
    On Fri, Sep 05, 2003 at 11:27:56AM -0700, markw@osdl.org wrote:
    > FUNCTIONS SORTED BY LOAD:
    > -- ------------------------- ------- ------------------------- -------
    > # as 2.6.0-test4-mm3 ticks deadline 2.6.0-test4-mm3 ticks
    > -- ------------------------- ------- ------------------------- -------
    > 1 default_idle 5746007 default_idle 5764451
    > 2 schedule 53609 schedule 52174
    > 3 scsi_request_fn 29340
    > do_softirq 25905
    > 4 __make_request 25949 scsi_request_fn 23549
    > 5 do_softirq 25560 __make_request 20325
    > 6 scsi_end_request 16524 try_to_wake_up 11723
    > 7 try_to_wake_up 11939 scsi_end_request 11340
    > 8 dio_bio_end_io 11253 dio_bio_end_io 10950
    > 9 do_anonymous_page 8234 do_anonymous_page 8110
    > 10 ipc_lock 7366 ipc_lock 6706
    > 11 sys_semtimedop 5493 sys_semtimedop 5152
    > 12 sysenter_past_esp 5080 sysenter_past_esp 5064
    > 13 direct_io_worker 5065 direct_io_worker 4732
    > 14 dio_await_one 4084 dio_await_one 3779
    > 15 __copy_to_user_ll 3643 __mod_timer 3571
    > 16 __mod_timer 3582 blk_run_queue 3521
    > 17 blk_run_queue 3411 __copy_to_user_ll 3495
    > 18 __might_sleep 3316 __might_sleep 3277
    > 19 kmem_cache_alloc 3225 kmem_cache_alloc 3054
    > 20 semctl_main 3072 semctl_main 3016
    >

    Looking at this quickly, scsi_request_fn, __make_request, and
    scsi_end_request are show the most additional cost on AS. As well as
    __copy_to_user_ll and ipc_lock.
    -
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