????Linux ?? I/O ??????????????? I/O ????洢???????????????????????????Linux I/O ??????????????????????豸????????У????????????Щ I/O ??????????????????·? I/O ?????豸??????????????????????????????????????
?????? Linux ??????????? I/O ????????
????1??noop - ??????????洢???豸??
????2??cfq - ????????????????????????IO?????
????3??Deadline - ?????????????????? I/O?????????????????
????4??Anticipatory - ????????????? Deadline ??????????????????????????
???????豸????? I/O ????????
????# cat /sys/block//queue/scheduler
????????????????? /dev/sdc??
????# cat /sys/block/sdc/queue/schedulernoop anticipatory deadline [cfq]
??????θ??????豸 I/O ??????
??????????????
????# echo {SCHEDULER-NAME} > /sys/block//queue/scheduler
???????????? noop ??????:
????# echo noop > /sys/block/sdc/queue/scheduler
???????????????????Ч??????????????????Ч??????????????????н? elevator=noop д?? /boot/grub/menu.lst??
????1. ???? menu.lst ???
????cp -p /boot/grub/menu.lst /boot/grub/menu.lst-backup
????2. ???? /boot/grub/menu.lst
?????? elevator=noop ????????β?????磺
????kernel /vmlinuz-2.6.16.60-0.91.1-smp root=/dev/sysvg/root splash=silent splash=off showopts elevator=noop