linux-kernel - Re: [v6] kvm/fpu: Enable fully eager restore kvm FPU

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Message-ID: <55390F9A.2070808@intel.com>
Date:	Thu, 23 Apr 2015 08:28:26 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Liang Li <liang.z.li@...el.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
CC:	gleb@...nel.org, pbonzini@...hat.com, mtosatt@...hat.com,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, joro@...tes.org, yang.z.zhang@...el.com,
	Xudong Hao <xudong.hao@...el.com>
Subject: Re: [v6] kvm/fpu: Enable fully eager restore kvm FPU

On 04/23/2015 02:13 PM, Liang Li wrote:
> When compiling kernel on westmere, the performance of eager FPU
> is about 0.4% faster than lazy FPU.

Do you have an theory why this is?  What does the regression come from?


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