linux-kernel - Re: [PATCH] x86/TSC: Use RDTSCP

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Message-ID: <a1b79c06-ab34-e774-df6b-c98323b13bae@zytor.com>
Date:   Mon, 19 Nov 2018 12:17:35 -0800
From:   "H. Peter Anvin" <hpa@...or.com>
To:     Andy Lutomirski <luto@...nel.org>, Borislav Petkov <bp@...en8.de>
Cc:     X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        John Stultz <john.stultz@...aro.org>,
        Tom Lendacky <Thomas.Lendacky@....com>
Subject: Re: [PATCH] x86/TSC: Use RDTSCP

On 11/19/18 11:52 AM, Andy Lutomirski wrote:
> 
> I thought I benchmarked this on Intel at some point and found the
> LFENCE;RDTSC variant to be slightly faster.  But I believe you, so:
> 
> Acked-by: Andy Lutomirski <luto@...nel.org>
> 

As long as the difference isn't significant, the simplicity would seem to be a
win.

	-hpa