Re: OSDL DBT-2 AS vs. Deadline 2.6.0-test4-mm3
From: Mike Fedyk
Date: Fri Sep 05 2003 - 15:21:33 EST
On Fri, Sep 05, 2003 at 11:27:56AM -0700, markw@xxxxxxxx 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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