linux-kernel - Re: [GIT PULL] x86/cpu changes for v2.6.34

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Date:	Sun, 28 Feb 2010 12:45:51 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <borislav.petkov@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] x86/cpu changes for v2.6.34



On Sun, 28 Feb 2010, Linus Torvalds wrote:
> 
> I haven't bisected this, but something slowed down in bootup on my machine 
> recently.

Hmm. I take that back. It's not consistent, and it's not recent after all. 

It comes and goes:

	[torvalds@...alem linux]$ grep "CPU 7 MCA" /var/log/messages-* /var/log/messages | cut -d: -f5-
	 [    0.898396] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    0.898400] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    1.596240] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    0.898394] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    1.600229] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    0.898395] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    0.901211] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    2.633298] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    0.898393] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    0.901210] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    0.898395] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    0.898393] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    0.898393] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    0.898402] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    0.901213] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    0.898392] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    0.898395] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    1.601467] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    0.898401] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    0.898395] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8
	 [    0.898397] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8

note how it's pretty consistently at about the 0.89s mark, but then 
there's a _couple_ of times when it's taken rather longer to boot. But the 
delay is always in that CPU bringup phase, because doing the same grep for 
"CPU 0 MCA" gives consistently low numbers (0.0005s).

			Linus
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