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From: "H. Peter Anvin" <hpa@zytor.com>
To: Andy Lutomirski <luto@kernel.org>, Borislav Petkov <bp@alien8.de>
Cc: X86 ML <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
	John Stultz <john.stultz@linaro.org>,
	Tom Lendacky <Thomas.Lendacky@amd.com>
Subject: Re: [PATCH] x86/TSC: Use RDTSCP
Date: Mon, 19 Nov 2018 12:17:35 -0800	[thread overview]
Message-ID: <a1b79c06-ab34-e774-df6b-c98323b13bae@zytor.com> (raw)
In-Reply-To: <CALCETrV34q-BP2w8A1s82-a8Hg062=RYzk+SCOa31W7ftsznPA@mail.gmail.com>

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@kernel.org>
> 

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

	-hpa

  reply	other threads:[~2018-11-19 20:17 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-19 18:45 [PATCH] x86/TSC: Use RDTSCP Borislav Petkov
2018-11-19 19:02 ` Lendacky, Thomas
2018-11-19 19:52 ` Andy Lutomirski
2018-11-19 20:17   ` H. Peter Anvin [this message]
2018-11-19 20:40     ` Borislav Petkov
2018-11-19 20:48       ` hpa
2018-11-20  9:11 ` [tip:x86/timers] " tip-bot for Borislav Petkov
2018-11-23 20:03 ` [PATCH] " Guenter Roeck
2018-11-23 20:22   ` hpa
2018-11-23 20:44     ` Thomas Gleixner
2018-11-23 20:44   ` Borislav Petkov
2018-11-23 21:03     ` Guenter Roeck
2018-11-23 21:07       ` Borislav Petkov
2018-12-07 18:39         ` Borislav Petkov
2019-01-16 11:59 ` [tip:x86/alternatives] " tip-bot for Borislav Petkov

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