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

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From: Frans Pop <elendil@...>
To: Yinghai Lu <yhlu.kernel@...>
Cc: Jesse Barnes <jesse.barnes@...>, Pallipadi, Venkatesh <venkatesh.pallipadi@...>, <linux-kernel@...>, Ingo Molnar <mingo@...>, Packard, Keith <keith.packard@...>
Subject: Re: [git head] Should X86_PAT really default to yes?
Date: Monday, May 5, 2008 - 12:55 pm

On Sunday 04 May 2008, Yinghai Lu wrote:

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, 3:22 pm)
RE: [git head] Should X86_PAT really default to yes?, Pallipadi, Venkatesh, (Fri May 2, 3:37 pm)
Re: [git head] Should X86_PAT really default to yes?, Jesse Barnes, (Fri May 2, 4:40 pm)
Re: [git head] Should X86_PAT really default to yes?, Frans Pop, (Sun May 4, 3:10 am)
Re: [git head] Should X86_PAT really default to yes?, Jesse Barnes, (Mon May 5, 11:57 am)
Re: [git head] Should X86_PAT really default to yes?, Frans Pop, (Mon May 5, 1:32 pm)
Re: [git head] Should X86_PAT really default to yes?, Venki Pallipadi, (Tue May 6, 6:42 pm)
Re: [git head] Should X86_PAT really default to yes?, Frans Pop, (Sun May 25, 11:08 am)
Re: [git head] X86_PAT &amp; mprotect, Ingo Molnar, (Wed May 7, 3:02 am)
Re: [git head] X86_PAT &amp; mprotect, Venki Pallipadi, (Wed May 7, 6:36 pm)
Re: [git head] X86_PAT &amp; mprotect, Hugh Dickins, (Wed May 7, 3:18 pm)
Re: [git head] X86_PAT &amp; mprotect, Venki Pallipadi, (Wed May 7, 7:23 pm)
Re: [git head] X86_PAT &amp; mprotect, Ingo Molnar, (Fri May 9, 6:08 am)
Re: [git head] X86_PAT &amp; mprotect, Venki Pallipadi, (Fri May 9, 4:05 pm)
Re: [git head] X86_PAT &amp; mprotect, Dave Airlie, (Fri May 9, 6:11 pm)
Re: [git head] X86_PAT &amp; mprotect, Keith Packard, (Sat May 10, 1:45 am)
RE: [git head] X86_PAT &amp; mprotect, Pallipadi, Venkatesh, (Fri May 9, 6:20 pm)
Re: [git head] X86_PAT &amp; mprotect, Dave Airlie, (Sat May 10, 2:19 am)
Re: [git head] X86_PAT &amp; mprotect, Keith Packard, (Sat May 10, 2:29 am)
Re: [git head] X86_PAT &amp; mprotect, Venki Pallipadi, (Fri May 9, 4:09 pm)
Re: [git head] X86_PAT &amp; mprotect, Hugh Dickins, (Fri May 9, 4:48 pm)
Re: [git head] Should X86_PAT really default to yes?, Jesse Barnes, (Mon May 5, 1:45 pm)
Re: [git head] Should X86_PAT really default to yes?, Frans Pop, (Mon May 5, 2:59 pm)
Re: fb layer &amp; ioremap_wc, Jesse Barnes, (Mon May 5, 3:04 pm)
Re: fb layer &amp; ioremap_wc, Frans Pop, (Fri Jun 13, 12:42 pm)
RE: [git head] Should X86_PAT really default to yes?, Pallipadi, Venkatesh, (Mon May 5, 1:59 pm)
Re: [git head] Should X86_PAT really default to yes?, Yinghai Lu, (Sun May 4, 4:23 pm)
Re: [git head] Should X86_PAT really default to yes?, Frans Pop, (Mon May 5, 12:55 pm)
RE: [git head] Should X86_PAT really default to yes?, Pallipadi, Venkatesh, (Mon May 5, 1:00 pm)
Re: [git head] Should X86_PAT really default to yes?, Frans Pop, (Mon May 5, 2:56 pm)
Re: [git head] Should X86_PAT really default to yes?, Yinghai Lu, (Mon May 5, 1:42 pm)
Re: [git head] Should X86_PAT really default to yes?, Ingo Molnar, (Sun May 4, 5:04 am)
RE: [git head] Should X86_PAT really default to yes?, Pallipadi, Venkatesh, (Fri May 2, 5:55 pm)
Re: [git head] Should X86_PAT really default to yes?, Jesse Barnes, (Fri May 2, 6:07 pm)

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