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• Linux/HDD DMA関係 へ行く。
  • 1 (2012-09-18 (火) 18:22:36)
  • 2 (2012-09-21 (金) 16:30:59)

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Linux

HDD DMA関係†

LinuxでDMAモードオン†

 # IDE HDD DMA MODE
 /sbin/hdparm -c1 /dev/hda
 /sbin/hdparm -d1 /dev/hda

LinuxでHDD-DISKモードを調査†

 [root@mailservice kanri]# /sbin/hdparm -i /dev/hda
  Model=Maxtor 5T030H3, FwRev=TAH71DP0, SerialNo=T3D1FPRC
  Config={ Fixed }
  RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
  BuffType=3(DualPortCache), BuffSize=2048kB, MaxMultSect=16, MultSect=16
  DblWordIO=no, OldPIO=2, DMA=yes, OldDMA=0
  CurCHS=16383/16/63, CurSects=4228907259, LBA=yes, LBAsects=60030432
  tDMA={min:120,rec:120}, DMA modes: mword0 mword1 mword2
  IORDY=on/off, tPIO={min:120,w/IORDY:120}, PIO modes: mode3 mode4
  UDMA modes: mode0 mode1 mode2 mode3 mode4 *mode5

LinuxでHDDISK速度を測る†

 happy(UDMA100)
   [root@happy kanri]# /sbin/hdparm -t /dev/hda
    Timing buffered disk reads:  64 MB in  1.79 seconds = 35.75 MB/sec(Reiserfs)
 mailservice(爆撃マシン)
   [root@mailservice kanri]# /sbin/hdparm -t /dev/hda
    Timing buffered disk reads:  64 MB in  2.17 seconds = 29.49 MB/sec(Ext3)
   [root@mailservice /dmcont]# /sbin/hdparm -t /dev/sda
    Timing buffered disk reads:  64 MB in  1.59 seconds = 40.25 MB/sec(Ext2)

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