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Title:

I/O????

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Title: 4 Author: Freedom Last modified by: freedom Created Date: 6/10/2004 2:43:06 AM Document presentation format: – PowerPoint PPT presentation

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Title: I/O????


1
?4? ????
  • ??????????????
  • ?????????????????(?????????)
  • ????????????????

2
?4? ????
  • 4.1 ??
  • ????,?????(???????)
  • I/O????
  • ?? ?-?I/O???-???
  • ?? ???,??
  • I/O??????,?????,??,
  • ???????

3
  • 4.1.1 ????
  • ????1 ???? 2 ????(?????)
  • ??????1 ??? 2????
  • ????1?? 2?? 3??(???)
  • 4.1.2 ?????????
  • 1 ??????????,????
  • UNIX?????,???????,???????
  • 2 ???? ??????,???????
  • 3 ????,???
  • ???????????OS?????
  • ??(??)??-?????

4
  • 4.1.3 ?????????
  • i)I/O??????
  • ii)I/O????
  • iii)?????I/O??

5
4.2 ????????
  • 4.2.1 I/O????
  • 1 ????????(????I/O??)
  • 2 ??????
  • ?????CPU????????????
  • ??????????,??,????,?I/O??,????
  • ??????,CPU?????
  • 3 ???????(DMA)????
  • ?? ???? ???-??? DMA???
  • CPU????????????
  • 4 ??I/O?? I/O???,?CPU????
  • ??--???--?? ???,???,???

6
  • 4.2.2 ???? ??cache ??buffer
  • ????????CPU???????,?????,?I/O???,??????????I/O????
    ?,????????,??????
  • ???????????OS??????????n???????????,
  • ???,???
  • ??1 ????
  • 2 ?????????
  • 3 ?????(??,??,??)
  • DOS 6?,config.sys?,buffer???????smartdrv.exe
  • 4.2.3 ?????? plug and play PnP
  • Win9x,2k,XP,Linux INT?,I/O?,DMA??

7
4.3 ????
  • ?????
  • 4.3.1 ??????
  • 1 ?????????
  • ?????,???
  • 2 ?????????
  • DCB ????? CUCB??????
  • CCB ?????
  • ???,??,??
  • 3 ??????
  • DCB-?CCB-?CUCB

8
  • 4.3.2 ??????(??)
  • ???????????????
  • 1 ??????
  • 2 ????????
  • ???,??????
  • ??????,??????
  • ?????,????

9
  • 4.3.3 ????--?????
  • 1 ???,?? ??CPU,????,????
  • 2 ???
  • ????
  • ?????????I/O??(???)????????I/O??,??????,???????,?S
    pooling??,?????
  • ??????,
  • ????-???????-????

10
4.4 ?????
  • 4.4.1 ??????
  • ?????(??)???
  • ?????????
  • ????
  • ????,???,??I/O,I/O??(DMA/????,??????)

11
(No Transcript)
12
  • 4.4.2 ??????
  • ?????? TA TSTRTT
  • 1) ????Ts??
  • ??????(??)???????????????
  • 2) ??????TR??
  • ????????????????????
  • 3) ????TT??
  • ??????????????????????????

13
  • ?????FCFS(First-Come, First Served)
  • ???? 53
  • ???? ?? 98,183,37,122,14,124,65,67
  • ???????

14
  • 2. ????????SSTF(Shortest Seek Time First)
  • ???? 53
  • ???? 98,183,37,122,14,124,65,67
  • ???? 65,67,37,14,98,122,124,183

15
  • 3.??????
  • SSTF??????????????, ??????????????(Starvatio
    n)??????????????????, ???????????????????????,????
    ??I/O?????????
  • ?SSTF??????,????????????????,????????,????????
    ???,???????????????????
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