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From: Andi Kleen <andi@firstfloor.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
	Andi Kleen <andi@firstfloor.org>,
	linux@sandersweb.net, linux-kernel@vger.kernel.org,
	the arch/x86 maintainers <x86@kernel.org>,
	Andi Kleen <andi-suse@firstfloor.org>
Subject: Re: [BUG] x86 kenel won't boot under Virtual PC
Date: Mon, 8 Sep 2008 19:00:29 +0200	[thread overview]
Message-ID: <20080908170029.GP26079@one.firstfloor.org> (raw)
In-Reply-To: <alpine.LFD.1.10.0809080916550.3117@nehalem.linux-foundation.org>

On Mon, Sep 08, 2008 at 09:20:06AM -0700, Linus Torvalds wrote:
> 
> 
> On Mon, 8 Sep 2008, H. Peter Anvin wrote:
> > 
> > And yes, it should be the default.  The patch I have makes it
> > "default y" as well as change the help text.
> 
> It sounds like it shouldn't be a default at all, it should just _always_ 
> be on, if there really are gcc's that care that much. Most of our 

Originally it was an option because the 128 byte cache line it selects
caused bloat in several important data structures. That was back
then when cache line padded NR_CPUs arrays were still pretty common.
I don't know if it's still a problem, but before making it default y
it would be good to check the dynamic+static memory cost at least.

-Andi

  parent reply	other threads:[~2008-09-08 16:57 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-08-31 18:22 [BUG] x86 kenel won't boot under Virtual PC David Sanders
2008-08-31 18:47 ` Linus Torvalds
2008-08-31 19:27   ` Arjan van de Ven
2008-08-31 19:39     ` Linus Torvalds
2008-09-05 15:38       ` David Sanders
2008-09-05 16:15         ` Jan Beulich
2008-09-05 16:39           ` Linus Torvalds
2008-09-05 18:43             ` Ingo Molnar
2008-09-05 20:06               ` H. Peter Anvin
2008-09-05 19:08             ` Jeremy Fitzhardinge
2008-09-05 20:12           ` H. Peter Anvin
2008-09-05 16:30         ` Linus Torvalds
2008-09-05 17:55           ` Andi Kleen
2008-08-31 20:03   ` David Sanders
2008-09-01 20:23     ` David Sanders
2008-09-01 22:22       ` Linus Torvalds
2008-09-02 12:08         ` David Sanders
2008-09-02 18:12           ` Linus Torvalds
2008-09-02 18:44             ` David Sanders
2008-09-03 11:09               ` Peter Zijlstra
2008-09-03 11:20                 ` David Sanders
     [not found] ` <48C1C156.9080003@zytor.com>
2008-09-07 20:07   ` David Sanders
2008-09-07 23:22     ` David Sanders
2008-09-08  1:48       ` H. Peter Anvin
2008-09-08  2:49         ` David Sanders
2008-09-08  4:04           ` H. Peter Anvin
2008-09-08  9:42             ` Andi Kleen
2008-09-08 13:25             ` David Sanders
2008-09-08 15:09             ` Linus Torvalds
2008-09-08 15:23               ` Ingo Molnar
2008-09-08 15:36                 ` H. Peter Anvin
2008-09-08 15:38                 ` David Sanders
2008-09-08 15:38                 ` H. Peter Anvin
2008-09-08 15:45               ` Andi Kleen
2008-09-08 15:43                 ` H. Peter Anvin
2008-09-08 15:50                   ` H. Peter Anvin
2008-09-08 15:50                   ` Andi Kleen
2008-09-08 15:50                     ` H. Peter Anvin
2008-09-08 15:57                       ` Andi Kleen
2008-09-08 15:54                         ` H. Peter Anvin
2008-09-08 16:07                   ` Linus Torvalds
2008-09-08 16:13                     ` H. Peter Anvin
2008-09-08 16:15                       ` H. Peter Anvin
2008-09-08 16:26                         ` David Sanders
2008-09-08 16:20                       ` Linus Torvalds
2008-09-08 16:32                         ` H. Peter Anvin
2008-09-08 17:02                           ` Ingo Molnar
2008-09-08 16:34                         ` david
2008-09-08 16:42                           ` H. Peter Anvin
2008-09-08 18:51                             ` david
2008-09-08 16:59                           ` Linus Torvalds
2008-09-08 17:00                         ` Andi Kleen [this message]
2008-09-08 17:04                           ` Linus Torvalds
2008-09-08 17:08                             ` H. Peter Anvin
2008-09-08 17:12                               ` H. Peter Anvin
2008-09-08 17:41                                 ` Linus Torvalds
2008-09-08 17:38                               ` Linus Torvalds
2008-09-08 17:59                                 ` H. Peter Anvin
2008-09-08 19:09                                 ` H. Peter Anvin
2008-09-08 22:42                                   ` Linus Torvalds
2008-09-08 17:18                             ` Andi Kleen

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