From owner-svn-src-head@FreeBSD.ORG Tue Feb 10 18:55:58 2015 Return-Path: Delivered-To: svn-src-head@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id C6AAA9C0; Tue, 10 Feb 2015 18:55:58 +0000 (UTC) Received: from st11p02mm-asmtp002.mac.com (st11p02mm-asmtpout002.mac.com [17.172.220.237]) (using TLSv1.2 with cipher DHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 9227C774; Tue, 10 Feb 2015 18:55:57 +0000 (UTC) Received: from st11p02mm-spool001.mac.com ([17.172.220.246]) by st11p02mm-asmtp002.mac.com (Oracle Communications Messaging Server 7.0.5.35.0 64bit (built Dec 4 2014)) with ESMTP id <0NJK00LTFKKGF200@st11p02mm-asmtp002.mac.com>; Tue, 10 Feb 2015 18:55:29 +0000 (GMT) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.13.68,1.0.33,0.0.0000 definitions=2015-02-10_06:2015-02-10,2015-02-10,1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=18 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=7.0.1-1412110000 definitions=main-1502100177 MIME-version: 1.0 Received: from localhost ([17.172.220.163]) by st11p02mm-spool001.mac.com (Oracle Communications Messaging Server 7.0.5.33.0 64bit (built Aug 27 2014)) with ESMTP id <0NJK007XPKKG1150@st11p02mm-spool001.mac.com>; Tue, 10 Feb 2015 18:55:28 +0000 (GMT) To: Slawa Olhovchenkov From: Rui Paulo Subject: Re: svn commit: r278479 - in head: etc sys/kern Date: Tue, 10 Feb 2015 18:55:28 +0000 (GMT) X-Mailer: iCloud MailClient15A99 MailServer14H18.17359 X-Originating-IP: [12.218.212.178] Message-id: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.18-1 Cc: "svn-src-head@freebsd.org" , Adrian Chadd , "src-committers@freebsd.org" , "svn-src-all@freebsd.org" , John Baldwin X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Feb 2015 18:55:59 -0000 On Feb 10, 2015, at 10:52 AM, Slawa Olhovchenkov wrote:=0A= For common case (I am not talk about current devd implementation -- I=0Aam= don't have any inforamtion/metrics/etc) routing and processing=0Aevents m= ay be sensitive to delay and ordering: may be exist=0Arequirement 'delay n= ot more then 700ns', may be exist requirement=0A'next event process only a= fter complete process previos event'. And=0Asome event handling may be ver= y CPU/disk/etc consumption. Need to good=0Athink over and design API and a= rchitecure.=0A=C2=A0=0Arouting events do not come over devd (or any other = /dev device): there's a routing socket specifically tailored for that purp= ose. =C2=A0For that type of latency, you probably don't want to be crossin= g the kernel/userland barrier too often (or never).=