笔记本装ml2，感觉系统很慢

wwwaptx

我也有同样的问题:打不开DMA,不知是为什么,希望哪位达人帮忙解决一下.

hotmeteor

[quote:8a2a4c2e52="straywind"]我的本本和楼主的配置差不多，也是cm1.4，915gm芯片组的，512m内存。就是硬盘的DMA不能打开。装SuSe Linux时是可以打开的，那时，我的硬盘被认成是"sda"。在ml2.0下就变成"hdc"。硬盘的读取速度降了一个数量级，从20多M每秒变成2点多M每秒。解压缩特别的慢，在打开较大的程序时还会干扰到听歌。
用root执行"hdparm -Tt /dev/(硬盘)"看看你的情况怎样？[/quote]
出来一大串东西，看不懂：

hdparm - get/set hard disk parameters - version v6.3

Usage:  hdparm  [options] [device] ..

Options:
-a   get/set fs readahead
-A   set drive read-lookahead flag (0/1)
-b   get/set bus state (0 == off, 1 == on, 2 == tristate)
-B   set Advanced Power Management setting (1-255)
-c   get/set IDE 32-bit IO setting
-C   check IDE power mode status
-d   get/set using_dma flag
--direct  use O_DIRECT to bypass page cache for timings
-D   enable/disable drive defect management
-E   set cd-rom drive speed
-f   flush buffer cache for device on exit
-g   display drive geometry
-h   display terse usage information
-i   display drive identification
-I   detailed/current information directly from drive
--Istdin  read identify data from stdin as ASCII hex
--Istdout write identify data to stdout as ASCII hex
-k   get/set keep_settings_over_reset flag (0/1)
-K   set drive keep_features_over_reset flag (0/1)
-L   set drive doorlock (0/1) (removable harddisks only)
-M   get/set acoustic management (0-254, 128: quiet, 254: fast) (EXPERIMENTAL)
-m   get/set multiple sector count
-n   get/set ignore-write-errors flag (0/1)
-p   set PIO mode on IDE interface chipset (0,1,2,3,4,...)
-P   set drive prefetch count
-q   change next setting quietly
-Q   get/set DMA tagged-queuing depth (if supported)
-r   get/set device  readonly flag (DANGEROUS to set)
-R   register an IDE interface (DANGEROUS)
-S   set standby (spindown) timeout
-t   perform device read timings
-T   perform cache read timings
-u   get/set unmaskirq flag (0/1)
-U   un-register an IDE interface (DANGEROUS)
-v   defaults; same as -mcudkrag for IDE drives
-V   display program version and exit immediately
-w   perform device reset (DANGEROUS)
-W   set drive write-caching flag (0/1) (DANGEROUS)
-x   tristate device for hotswap (0/1) (DANGEROUS)
-X   set IDE xfer mode (DANGEROUS)
-y   put IDE drive in standby mode
-Y   put IDE drive to sleep
-Z   disable Seagate auto-powersaving mode
-z   re-read partition table
--security-help  display help for ATA security commands

意识

我觉得ML是启动算快速的了，我用其它的都难得这么好