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SubjectRe: IO scheduler benchmarking
From
> Why does 2.5.62-mm2 have higher sequential
> write latency than 2.5.61-mm1?

Anticipatory scheduler tiobench profile on uniprocessor:

2.5.61-mm1 2.5.62-mm2
total 1993387 1933241
default_idle 1873179 1826650
system_call 49838 43036
get_offset_tsc 21905 20883
do_schedule 13893 10344
do_gettimeofday 8478 6044
sys_gettimeofday 8077 5153
current_kernel_time 4904 12165
syscall_exit 4047 1243
__wake_up 1274 1000
io_schedule 1166 1039
prepare_to_wait 1093 792
schedule_timeout 612 366
delay_tsc 502 443
get_fpu_cwd 473 376
syscall_call 389 378
math_state_restore 354 271
restore_fpu 329 287
del_timer 325 200
device_not_available 290 377
finish_wait 257 181
add_timer 218 137
io_schedule_timeout 195 72
cpu_idle 193 218
run_timer_softirq 137 33
remove_wait_queue 121 188
eligible_child 106 154
sys_wait4 105 162
work_resched 104 110
ret_from_intr 97 74
dup_task_struct 75 48
add_wait_queue 67 124
__cond_resched 59 69
do_page_fault 55 0
do_softirq 53 12
pte_alloc_one 51 67
release_task 44 55
get_signal_to_deliver 38 43
get_wchan 16 10
mod_timer 15 0
old_mmap 14 19
prepare_to_wait_exclusive 10 32
mm_release 7 0
release_x86_irqs 7 8
sys_getppid 6 5
handle_IRQ_event 4 0
schedule_tail 4 0
kill_proc_info 3 0
device_not_available_emulate 2 0
task_prio 1 1
__down 0 33
__down_failed_interruptible 0 3
init_fpu 0 12
pgd_ctor 0 3
process_timeout 0 2
restore_all 0 2
sys_exit 0 2
--
Randy Hron
http://home.earthlink.net/~rwhron/kernel/bigbox.html

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