From owner-freebsd-net Mon Jun 24 10: 2:59 2002 Delivered-To: freebsd-net@freebsd.org Received: from patrocles.silby.com (d91.as7.nwbl0.wi.voyager.net [169.207.128.219]) by hub.freebsd.org (Postfix) with ESMTP id 9327037B40B; Mon, 24 Jun 2002 10:02:04 -0700 (PDT) Received: from patrocles.silby.com (localhost [127.0.0.1]) by patrocles.silby.com (8.12.4/8.12.4) with ESMTP id g5OH4Hcv053382; Mon, 24 Jun 2002 12:04:17 -0500 (CDT) (envelope-from silby@silby.com) Received: from localhost (silby@localhost) by patrocles.silby.com (8.12.4/8.12.4/Submit) with ESMTP id g5OH4Fqg053379; Mon, 24 Jun 2002 12:04:16 -0500 (CDT) X-Authentication-Warning: patrocles.silby.com: silby owned process doing -bs Date: Mon, 24 Jun 2002 12:04:14 -0500 (CDT) From: Mike Silbersack To: "Kenneth D. Merry" Cc: net@freebsd.org, Subject: Re: zero copy code checkin in 2 days, new snapshot In-Reply-To: <20020624002106.A44519@panzer.kdm.org> Message-ID: <20020624120341.K53369-100000@patrocles.silby.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org On Mon, 24 Jun 2002, Kenneth D. Merry wrote: > 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 Cool, thttpd / others should benefit greatly then. Mike "Silby" Silbersack To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message