From owner-freebsd-current Sun Jun 23 23:21:23 2002 Delivered-To: freebsd-current@freebsd.org Received: from panzer.kdm.org (panzer.kdm.org [216.160.178.169]) by hub.freebsd.org (Postfix) with ESMTP id BD8B337B401; Sun, 23 Jun 2002 23:21:18 -0700 (PDT) Received: (from ken@localhost) by panzer.kdm.org (8.11.6/8.9.1) id g5O6L6W44543; Mon, 24 Jun 2002 00:21:06 -0600 (MDT) (envelope-from ken) Date: Mon, 24 Jun 2002 00:21:06 -0600 From: "Kenneth D. Merry" To: Mike Silbersack Cc: net@freebsd.org, current@freebsd.org Subject: Re: zero copy code checkin in 2 days, new snapshot Message-ID: <20020624002106.A44519@panzer.kdm.org> References: <20020623233627.A44237@panzer.kdm.org> <20020624011221.L50974-100000@patrocles.silby.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: <20020624011221.L50974-100000@patrocles.silby.com>; from silby@silby.com on Mon, Jun 24, 2002 at 01:17:03AM -0500 Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Mon, Jun 24, 2002 at 01:17:03 -0500, Mike Silbersack wrote: > On Sun, 23 Jun 2002, Kenneth D. Merry wrote: > > > I'm planning on checking in the zero copy sockets code Tuesday evening, > > MDT. If there are any concerns, I'm more than willing to delay it. > > Out of curiousity, what happens when the page being write()n is a mmap'd > page shared by multiple processes? Will the page be shared? That could > be a big reduction in mbuf cluster usage on some http/ftp systems, I'd > guess. The page would be shared, until one of the processes decides to write to it while it is still referenced in the kernel. If that happens, it'll get copied. Ken -- Kenneth Merry ken@kdm.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message