linux-kernel - Re: How to measure enable_kernel

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Message-ID: <20110605003118.GP27166@one.firstfloor.org>
Date:	Sun, 5 Jun 2011 02:31:18 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	George Spelvin <linux@...izon.com>
Cc:	andi@...stfloor.org, linux-kernel@...r.kernel.org
Subject: Re: How to measure enable_kernel_fpu overhead?

On Sat, Jun 04, 2011 at 08:23:23PM -0400, George Spelvin wrote:
> > This seems to clever for its own good. Even if you come up with some
> > number on one CPU it could be completely different on another.
> > I would suggest KISS.
> 
> I don't understand.  Do you mean different CPUs of the same SMP system?
> That would be really bad...

Different CPU models. This years CPUs does this and next years that.

> on my systems, it would be easy.  But that's so obviously not useful
> that I didn't bother to mention it.

AFAIK you cannot merge anyways as anonymous, so it's moot.

-Andi
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