From owner-svn-src-head@freebsd.org  Sun Oct 29 22:23:07 2017
Return-Path: <owner-svn-src-head@freebsd.org>
Delivered-To: svn-src-head@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 00AEAE4DEC9
 for <svn-src-head@mailman.ysv.freebsd.org>;
 Sun, 29 Oct 2017 22:23:07 +0000 (UTC)
 (envelope-from grehan@freebsd.org)
Received: from alto.onthenet.com.au (alto.OntheNet.com.au [203.13.68.12])
 by mx1.freebsd.org (Postfix) with ESMTP id 9FAD3697D7
 for <svn-src-head@freebsd.org>; Sun, 29 Oct 2017 22:23:06 +0000 (UTC)
 (envelope-from grehan@freebsd.org)
Received: from iredmail.onthenet.com.au (iredmail.onthenet.com.au
 [203.13.68.150])
 by alto.onthenet.com.au (Postfix) with ESMTPS id E0E5C20ADBED
 for <svn-src-head@freebsd.org>; Mon, 30 Oct 2017 08:15:23 +1000 (AEST)
Received: from localhost (iredmail.onthenet.com.au [127.0.0.1])
 by iredmail.onthenet.com.au (Postfix) with ESMTP id DB9B1281E00
 for <svn-src-head@freebsd.org>; Mon, 30 Oct 2017 08:15:23 +1000 (AEST)
X-Amavis-Modified: Mail body modified (using disclaimer) -
 iredmail.onthenet.com.au
Received: from iredmail.onthenet.com.au ([127.0.0.1])
 by localhost (iredmail.onthenet.com.au [127.0.0.1]) (amavisd-new, port 10026)
 with ESMTP id d8vkd8qn7J6Y for <svn-src-head@freebsd.org>;
 Mon, 30 Oct 2017 08:15:23 +1000 (AEST)
Received: from Peters-MacBook-Pro-2.local
 (50-0-69-205.dsl.static.fusionbroadband.com [50.0.69.205])
 by iredmail.onthenet.com.au (Postfix) with ESMTPSA id 7A63D280910;
 Mon, 30 Oct 2017 08:15:20 +1000 (AEST)
Subject: Re: svn commit: r325108 - head/sys/amd64/vmm/io
To: Ian Lepore <ian@freebsd.org>, src-committers@freebsd.org,
 svn-src-all@freebsd.org, svn-src-head@freebsd.org
References: <201710292050.v9TKo3j5058456@repo.freebsd.org>
 <1509310495.21609.60.camel@freebsd.org>
From: Peter Grehan <grehan@freebsd.org>
Message-ID: <3b1ffc68-def3-04f6-2a1e-af44d6f3b4a5@freebsd.org>
Date: Sun, 29 Oct 2017 15:15:17 -0700
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:52.0)
 Gecko/20100101 Thunderbird/52.4.0
MIME-Version: 1.0
In-Reply-To: <1509310495.21609.60.camel@freebsd.org>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: quoted-printable
X-CMAE-Score: 0
X-CMAE-Analysis: v=2.2 cv=XKlAcUpE c=1 sm=1 tr=0
 a=A6CF0fG5TOl4vs6YHvqXgw==:117 a=3jPexO113QScgro132hsCQ==:17
 a=IkcTkHD0fZMA:10 a=02M-m0pO-4AA:10 a=mkUh-SqEeZ4b2_Ug4rsA:9
 a=QEXdDO2ut3YA:10 wl=host:3
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
 <svn-src-head.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head/>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 29 Oct 2017 22:23:07 -0000

>>  =C2=A0 Improve the performance of the hpet timer in bhyve guests by m=
aking the
>>  =C2=A0 timer frequency a power of two.=C2=A0=C2=A0This changes the fr=
equency from 10 to
>>  =C2=A0 16.7 MHz (2 ^ 24 HZ).=C2=A0=C2=A0Using a power of two avoids r=
oundoff errors when
>>  =C2=A0 doing arithmetic in sbintime_t units.
>>   =20
>>  =C2=A0 Testing shows this can fix erratic ntpd behavior in guests usi=
ng the
>>  =C2=A0 hpet timer (which is the default for multicore guests).
>>   =20
>>  =C2=A0 Reported by:	bsam@
>>
>> Modified:
>>  =C2=A0 head/sys/amd64/vmm/io/vhpet.c

  In the future please respect MAINTAINERS and file a phab review for=20
code in this area.

later,

Peter.