linux-kernel - Re: [RFC PATCH] x86, fpu: Use eagerfpu by default on all CPUs

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Message-ID: <20150222125736.GA25667@gmail.com>
Date:	Sun, 22 Feb 2015 13:57:36 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Oleg Nesterov <oleg@...hat.com>,
	Rik van Riel <riel@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [RFC PATCH] x86, fpu: Use eagerfpu by default on all CPUs


* Borislav Petkov <bp@...en8.de> wrote:

> Lazy FPU:
>      219.406449195 seconds time elapsed                                          ( +-  0.17% )

> Eager FPU:
>      218.791122148 seconds time elapsed                                          ( +-  0.13% )

> Timing improvement of 0.6 secs on average looks nice to 
> me. Next I'll do the same thing in tmpfs to see how the 
> numbers look without the page cache.

This is also very similar to the ~0.6 secs improvement your 
first set of numbers gave.

So now that it appears we have consistent numbers, it would 
be nice to check it on older hardware (and other workloads) 
as well, to see whether it's a consistent win.

Thanks,

	Ingo
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