linux-kernel - Re: [PATCH] x86: fix detection of CONSTANT

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Date:	Wed, 16 Jan 2008 21:28:20 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andreas Herrmann <andreas.herrmann3@....com>
Cc:	tglx@...utronix.de, hpa@...or.com, linux-kernel@...r.kernel.org,
	ak@...e.de
Subject: Re: [PATCH] x86: fix detection of CONSTANT_TSC bit for AMD CPUs


* Andreas Herrmann <andreas.herrmann3@....com> wrote:

> Commits
>  - c52f61fcbdb2aa84f0e4d831ef07f375e6b99b2c 
>   (x86: allow TSC clock source on AMD Fam10h and some cleanup)
>  - e30436f05d456efaff77611e4494f607b14c2782
>   (x86: move X86_FEATURE_CONSTANT_TSC into early cpu feature detection)
> 
> are supposed to fix the detection of contant TSC for AMD CPUs.
> Unfortunately on x86_64 it does still not work with current x86/mm.
> For a Phenom I still get:
> 
>   ...
>   TSC calibrated against PM_TIMER 
>   Marking TSC unstable due to TSCs unsynchronized
>   time.c: Detected 2288.366 MHz processor.
>   ...
> 
> We have to set c->x86_power in early_identify_cpu to properly detect
> the CONSTANT_TSC bit in early_init_amd.
> 
> Attached patch fixes this issue. Following the relevant boot
> messages when the fix is used:
> 
>   ...
>   TSC calibrated against PM_TIMER
>   time.c: Detected 2288.279 MHz processor.
>   ...
>   Initializing CPU#1
>   ...
>   checking TSC synchronization [CPU#0 -> CPU#1]: passed.
>   ...
>   Initializing CPU#2
>   ...
>   checking TSC synchronization [CPU#0 -> CPU#2]: passed.
>   ...
>   Booting processor 3/4 APIC 0x3
>   ...
>   checking TSC synchronization [CPU#0 -> CPU#3]: passed.
>   Brought up 4 CPUs
>   ...
> 
> Patch is against x86/mm (v2.6.24-rc8-672-ga9f7faa).
> Please apply.

thanks, applied.

	Ingo
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