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发表于 2009-2-17 21:48:59
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Post by Awei;1948906
前面刚刚进入XP查资料(无线网卡没有正常驱动),重启进入Gentoo,GDM启动时,居然闪过XP的桌面,就是那个蓝天绿草地的桌面,晕死。
可能内存没有清空吧……:yun:
Post by LongerZ;1948931
这一项具体提供什么功能?
和 MTRR 一样的功能,但是不稳定,甚至能引起崩溃。
MTRR:
- On Intel P6 family processors (Pentium Pro, Pentium II and later)
- the Memory Type Range Registers (MTRRs) may be used to control
- processor access to memory ranges. This is most useful if you have
- a video (VGA) card on a PCI or AGP bus. Enabling write-combining
- allows bus write transfers to be combined into a larger transfer
- before bursting over the PCI/AGP bus. This can increase performance
- of image write operations 2.5 times or more. Saying Y here creates a
- /proc/mtrr file which may be used to manipulate your processor's
- MTRRs. Typically the X server should use this.
- This code has a reasonably generic interface so that similar
- control registers on other processors can be easily supported
- as well:
- The Cyrix 6x86, 6x86MX and M II processors have Address Range
- Registers (ARRs) which provide a similar functionality to MTRRs. For
- these, the ARRs are used to emulate the MTRRs.
- The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
- MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
- write-combining. All of these processors are supported by this code
- and it makes sense to say Y here if you have one of them.
- Saying Y here also fixes a problem with buggy SMP BIOSes which only
- set the MTRRs for the boot CPU and not for the secondary CPUs. This
- can lead to all sorts of problems, so it's good to say Y here.
- You can safely say Y even if your machine doesn't have MTRRs, you'll
- just add about 9 KB to your kernel.
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PAT:
- Use PAT attributes to setup page level cache control.
- PATs are the modern equivalents of MTRRs and are much more flexible than MTRRs.
- Say N here if you see bootup problems (boot crash, boot hang, spontaneous reboots) or a non-working video driver.
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