From owner-svn-src-all@FreeBSD.ORG Wed May 20 13:19:26 2015 Return-Path: Delivered-To: svn-src-all@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 5D576323; Wed, 20 May 2015 13:19:26 +0000 (UTC) Received: from smtp.vangyzen.net (hotblack.vangyzen.net [IPv6:2607:fc50:1000:7400:216:3eff:fe72:314f]) by mx1.freebsd.org (Postfix) with ESMTP id 404D51729; Wed, 20 May 2015 13:19:26 +0000 (UTC) Received: from marvin.lab.vangyzen.net (c-73-147-253-17.hsd1.va.comcast.net [73.147.253.17]) by smtp.vangyzen.net (Postfix) with ESMTPSA id 37DD656467; Wed, 20 May 2015 08:19:25 -0500 (CDT) Message-ID: <555C89F4.9080607@FreeBSD.org> Date: Wed, 20 May 2015 09:19:48 -0400 From: Eric van Gyzen User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 MIME-Version: 1.0 To: Lawrence Stewart , Hiren Panchasara CC: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r283136 - head/sys/netinet References: <201505200108.t4K181No006311@svn.freebsd.org> <555C09D5.9090709@freebsd.org> <20150520042438.GA95600@strugglingcoder.info> <555C2ABC.60102@freebsd.org> In-Reply-To: <555C2ABC.60102@freebsd.org> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 May 2015 13:19:26 -0000 On 05/20/2015 02:33, Lawrence Stewart wrote: > On 05/20/15 14:24, Hiren Panchasara wrote: >> On 05/20/15 at 02:13P, Lawrence Stewart wrote: >>> Hi Hiren, >>> >>> On 05/20/15 11:08, Hiren Panchasara wrote: >>>> Author: hiren Date: Wed May 20 01:08:01 2015 New Revision: >>>> 283136 URL: https://svnweb.freebsd.org/changeset/base/283136 >>>> >>>> Log: Add a new sysctl net.inet.tcp.hostcache.purgenow=1 to >>>> expire and purge all entries in hostcache immediately. >>>> >>>> In collaboration with: bz, rwatson MFC after: 1 week Relnotes: >>>> yes Sponsored by: Limelight Networks >>> >>> Why introduce a new sysctl and not change the existing behaviour >>> of net.inet.tcp.hostcache.purge? >> >> I thought it'd make more sense to keep the existing behavior as is >> and provide new knob for the new behavior. > > Don't think so - why would deferring a purge to the next purge run be > useful compared to purging immediately? I'd strongly suggest you adapt > this change to the existing purge sysctl. I can't see why anyone would > miss the old functionality. I am generally wary of a question such as "Why would anyone want...", because as soon as the code is released, someone answers it. That being said, I have always wanted Hiren's purgenow behavior, and I've always been annoyed by the lazy-purge behavior. I would suggest implementing Lawrence's suggestion, but NOT MFC'ing it, since that would be a disruptive change. Thanks for your work, Hiren. Eric