Re: [git head] Should X86_PAT really default to yes?

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From: Frans Pop

Subject: Re: [git head] Should X86_PAT really default to yes?

Date: Monday, May 5, 2008 - 9:55 am

On Sunday 04 May 2008, Yinghai Lu wrote:
quoted text> can you boot with pat=off and send out /proc/mtrr?

Hmmm. Is 'pat=off' supposed to do anything?

With a default boot I see:
kernel: Command line: root=/dev/mapper/main-root ro vga=791
[...]
kernel: x86 PAT enabled: cpu 1, old 0x7040600070406, new 0x7010600070106

And with 'pat=off' I get the same:
kernel: Command line: root=/dev/mapper/main-root ro vga=791 pat=off
[...]
kernel: x86 PAT enabled: cpu 1, old 0x7040600070406, new 0x7010600070106

Anyway, the info in /proc/mtrr is identical with and without the option, and 
is also identical to what I get with 2.6.25.1:

$ cat /proc/mtrr
reg00: base=0x00000000 (   0MB), size=2048MB: write-back, count=1
reg01: base=0x7f800000 (2040MB), size=   8MB: uncachable, count=1
reg02: base=0x7f700000 (2039MB), size=   1MB: uncachable, count=1
reg03: base=0x80000000 (2048MB), size= 256MB: write-combining, count=1

Cheers,
FJP
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Messages in current thread:

[git head] Should X86_PAT really default to yes?, Frans Pop, (Fri May 2, 12:22 pm)

RE: [git head] Should X86_PAT really default to yes?, Pallipadi, Venkatesh, (Fri May 2, 12:37 pm)

Re: [git head] Should X86_PAT really default to yes?, Jesse Barnes, (Fri May 2, 1:40 pm)

RE: [git head] Should X86_PAT really default to yes?, Pallipadi, Venkatesh, (Fri May 2, 2:55 pm)

Re: [git head] Should X86_PAT really default to yes?, Jesse Barnes, (Fri May 2, 3:07 pm)

Re: [git head] Should X86_PAT really default to yes?, Frans Pop, (Sun May 4, 12:10 am)

Re: [git head] Should X86_PAT really default to yes?, Ingo Molnar, (Sun May 4, 2:04 am)

Re: [git head] Should X86_PAT really default to yes?, Yinghai Lu, (Sun May 4, 1:23 pm)

Re: [git head] Should X86_PAT really default to yes?, Jesse Barnes, (Mon May 5, 8:57 am)

Re: [git head] Should X86_PAT really default to yes?, Frans Pop, (Mon May 5, 9:55 am)

RE: [git head] Should X86_PAT really default to yes?, Pallipadi, Venkatesh, (Mon May 5, 10:00 am)

Re: [git head] Should X86_PAT really default to yes?, Frans Pop, (Mon May 5, 10:32 am)

Re: [git head] Should X86_PAT really default to yes?, Yinghai Lu, (Mon May 5, 10:42 am)

Re: [git head] Should X86_PAT really default to yes?, Jesse Barnes, (Mon May 5, 10:45 am)

RE: [git head] Should X86_PAT really default to yes?, Pallipadi, Venkatesh, (Mon May 5, 10:59 am)

Re: [git head] Should X86_PAT really default to yes?, Frans Pop, (Mon May 5, 11:56 am)

Re: [git head] Should X86_PAT really default to yes?, Frans Pop, (Mon May 5, 11:59 am)

Re: fb layer & ioremap_wc, Jesse Barnes, (Mon May 5, 12:04 pm)

Re: [git head] Should X86_PAT really default to yes?, Venki Pallipadi, (Tue May 6, 3:42 pm)

Re: [git head] X86_PAT & mprotect, Ingo Molnar, (Wed May 7, 12:02 am)

Re: [git head] X86_PAT & mprotect, Hugh Dickins, (Wed May 7, 12:18 pm)

Re: [git head] X86_PAT & mprotect, Venki Pallipadi, (Wed May 7, 3:36 pm)

Re: [git head] X86_PAT & mprotect, Venki Pallipadi, (Wed May 7, 4:23 pm)

Re: [git head] X86_PAT & mprotect, Ingo Molnar, (Fri May 9, 3:08 am)

Re: [git head] X86_PAT & mprotect, Venki Pallipadi, (Fri May 9, 1:05 pm)

Re: [git head] X86_PAT & mprotect, Venki Pallipadi, (Fri May 9, 1:09 pm)

Re: [git head] X86_PAT & mprotect, Hugh Dickins, (Fri May 9, 1:48 pm)

Re: [git head] X86_PAT & mprotect, Dave Airlie, (Fri May 9, 3:11 pm)

RE: [git head] X86_PAT & mprotect, Pallipadi, Venkatesh, (Fri May 9, 3:20 pm)

Re: [git head] X86_PAT & mprotect, Keith Packard, (Fri May 9, 10:45 pm)

Re: [git head] X86_PAT & mprotect, Dave Airlie, (Fri May 9, 11:19 pm)

Re: [git head] X86_PAT & mprotect, Keith Packard, (Fri May 9, 11:29 pm)

Re: [git head] Should X86_PAT really default to yes?, Frans Pop, (Sun May 25, 8:08 am)

Re: fb layer & ioremap_wc, Frans Pop, (Fri Jun 13, 9:42 am)