求助：硬盘的DMA无法打开。

broook

这是怎么回事？

1. hdparm -d1 -c1 -a1024 -m16 -u1 -k1 /dev/hdb
   
2. 
   
3. /dev/hdb:
   
4. setting fs readahead to 1024
   
5. setting 32-bit IO_support flag to 1
   
6. setting multcount to 16
   
7. setting unmaskirq to 1 (on)
   
8. setting using_dma to 1 (on)[color=DarkRed]
   
9. HDIO_SET_DMA failed: Operation not permitted[/color]
   
10. setting keep_settings to 1 (on)
    
11. multcount    = 16 (on)
    
12. IO_support   =  1 (32-bit)
    
13. unmaskirq    =  1 (on)
    
14. using_dma    =  0 (off)
    
15. keepsettings =  1 (on)
    
16. readahead    = 1024 (on)

复制代码

7dehao

你的硬盘是什么型号的？注意，内核中要支持对该硬盘的驱动。
# lspci -v

SEPTEM

主板的硬盘DMA模式应该也要开启才行吧！