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Date: Tue, 05 May 2015 12:15:00 -0700
From: Dave Hansen <dave.hansen@...ux.intel.com>
To: Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
CC: Andy Lutomirski <luto@...capital.net>,
Borislav Petkov <bp@...en8.de>,
Fenghua Yu <fenghua.yu@...el.com>,
"H. Peter Anvin" <hpa@...or.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Oleg Nesterov <oleg@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 207/208] x86/fpu: Add FPU performance measurement subsystem
On 05/05/2015 10:58 AM, Ingo Molnar wrote:
> x86/fpu: Cost of: XSAVE insn : 104 cycles
> x86/fpu: Cost of: XRSTOR insn : 80 cycles
Isn't there going to be pretty huge variability here depending on how
much state you are xsave/xrstor'ing and if the init/modified
optimizations are in play?
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