不知为何硬盘的DMA启用不了.

无花果

gentoo root # hdparm -tT /dev/hda

/dev/hda:
Timing buffer-cache reads:   468 MB in  2.01 seconds = 232.87 MB/sec
Timing buffered disk reads:   14 MB in  3.16 seconds =   4.43 MB/sec

gentoo root # hdparm -d 1 /dev/hda

/dev/hda:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma    =  0 (off)

Oxl

Post by 无花果
gentoo root # hdparm -tT /dev/hda

/dev/hda:
Timing buffer-cache reads:   468 MB in  2.01 seconds = 232.87 MB/sec
Timing buffered disk reads:   14 MB in  3.16 seconds =   4.43 MB/sec

gentoo root # hdparm -d 1 /dev/hda

/dev/hda:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma    =  0 (off)

你把DMA编译进内核了没有？

无花果

gentoo linux # grep DMA .config
CONFIG_GENERIC_ISA_DMA=y
CONFIG_BLK_DEV_IDEDMA_PCI=y
CONFIG_BLK_DEV_IDEDMA_FORCED=y
CONFIG_IDEDMA_PCI_AUTO=y
CONFIG_IDEDMA_ONLYDISK=y
CONFIG_BLK_DEV_IDEDMA=y
CONFIG_IDEDMA_IVB=y
CONFIG_IDEDMA_AUTO=y

blackwhite

hdparm -i /dev/hda的结果呢？
用livecd启动测试的结果呢？

无花果

在2.4内核下可以正常打开.

换在2.6就不行了, 都不知道是哪里的错.

1. 
   
2. gentoo root # hdparm -i /dev/hda
   
3. 
   
4. /dev/hda:
   
5. 
   
6. Model=ST340810A, FwRev=3.39, SerialNo=5FB3Y7P5
   
7. Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
   
8. RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
   
9. BuffType=unknown, BuffSize=2048kB, MaxMultSect=16, MultSect=16
   
10. CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=78165360
    
11. IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
    
12. PIO modes:  pio0 pio1 pio2 pio3 pio4
    
13. DMA modes:  mdma0 mdma1 mdma2
    
14. UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
    
15. AdvancedPM=yes: unknown setting WriteCache=enabled
    
16. Drive conforms to: device does not report version:
    
17. 
    
18. * signifies the current active mode
    

复制代码

无花果

终于成功.  原来是这项:

CONFIG_BLK_DEV_PIIX:

  This driver adds explicit support for Intel PIIX and ICH chips and also for the Efar Victory66 (slc90e66) chip.  This allows the kernel to change PIO, DMA and UDMA speeds and to configure the chip to optimum performance.