Xbox和Mac Mini

這個是上個月的新聞,原來Xbox電源線容易造成走火的事件
Xbox 替換電源線活動首頁和FAQ
看來我的電源線不用換...

Xbox的特異功能
從Xbox-Linux官網看到現在Xbox可以裝Fedora Core 3
另外這個網站還可以跑Mac OS X

說到Mac在Taiwan.CNET.com看到Fedora Core 4將支援Mac Mini真是太棒了!!!
看來又多了一個買Mac Mini的理由,網址如下：

Red Hat要拉回Fedora客戶

在Linux下打開DMA

hdparm指令,需要以Root身份執行

# hdparm /dev/hda (基本上FC3都己經預設DMA開啟)

/dev/hda:
multcount = 16 (on)
IO_support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
geometry = 15509/16/63, sectors = 8004132864, start = 0

# hdparm -d0 /dev/hda (參數d0為關閉,d1為開啟)

/dev/hda:
setting using_dma to 0 (off)
using_dma = 0 (off)

# hdparm -tT /dev/hda (DMA使用前測速)

/dev/hda:
Timing cached reads: 1196 MB in 2.00 seconds = 597.49 MB/sec
Timing buffered disk reads: 10 MB in 3.51 seconds = 2.85 MB/sec

# hdparm -tT /dev/hda (DMA使用後測速)

/dev/hda:
Timing cached reads: 1188 MB in 2.00 seconds = 593.50 MB/sec
Timing buffered disk reads: 70 MB in 3.07 seconds = 22.80 MB/sec

我們可以看到IO_support預設是關閉的,可以用-c3開啟32位元IO_support

# hdparm -c3 /dev/hda

/dev/hda:
setting 32-bit IO_support flag to 3
IO_support = 3 (32-bit w/sync)

以上指令重新開機之後就會失效,可以將指令寫到 /etc/rc.d/rc.local