From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1754152AbbFRJGh (ORCPT <rfc822;w@1wt.eu>);
	Thu, 18 Jun 2015 05:06:37 -0400
Received: from mail-wi0-f172.google.com ([209.85.212.172]:36252 "EHLO
	mail-wi0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1752890AbbFRJG3 (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Thu, 18 Jun 2015 05:06:29 -0400
Date: Thu, 18 Jun 2015 11:06:25 +0200
From: Ingo Molnar <mingo@kernel.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Lutomirski <luto@amacapital.net>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Denys Vlasenko <vda.linux@googlemail.com>,
        Borislav Petkov <bp@alien8.de>, X86 ML <x86@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: For your amusement: slightly faster syscalls
Message-ID: <20150618090624.GA22009@gmail.com>
References: <CALCETrXUiB9fCRERnKOpcsxmsm44qWw7vnk42j38B4+bJm0=RA@mail.gmail.com>
 <CA+55aFzMCeDc5rw8bj3Zyimbi7C1RcU15TeiMA6jOMfnd+3B=Q@mail.gmail.com>
 <557F46CF.8040003@zytor.com>
 <CALCETrXPiKkhPM7xhkCLtYc1VHgaedNTK8y5LymF135Zg-c8oQ@mail.gmail.com>
 <20150618080106.GA11473@gmail.com>
 <B1C32488-EADB-490F-9821-7454E273EF65@zytor.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <B1C32488-EADB-490F-9821-7454E273EF65@zytor.com>
User-Agent: Mutt/1.5.23 (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org


* H. Peter Anvin <hpa@zytor.com> wrote:

> Well... with UP we don't even need GS in the kernel...

Yeah, but it was just a simple demo, to see how much of a speedup the GS access 
reordering it is, so in that sense it was good enough to see that the speedup is 3 
cycles.

(Got the original email forwarded meanwhile.)

Thanks,

	Ingo