From owner-freebsd-hackers Fri Jul 13 11:45:39 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from ussenterprise.ufp.org (ussenterprise.ufp.org [208.185.30.210]) by hub.freebsd.org (Postfix) with ESMTP id BD40E37B403 for ; Fri, 13 Jul 2001 11:45:34 -0700 (PDT) (envelope-from bicknell@ussenterprise.ufp.org) Received: (from bicknell@localhost) by ussenterprise.ufp.org (8.11.1/8.11.1) id f6DIjOu26791; Fri, 13 Jul 2001 14:45:24 -0400 (EDT) (envelope-from bicknell) Date: Fri, 13 Jul 2001 14:45:24 -0400 From: Leo Bicknell To: Julian Elischer Cc: Leo Bicknell , freebsd-hackers@freebsd.org Subject: Re: Network performance roadmap. Message-ID: <20010713144524.A24595@ussenterprise.ufp.org> Mail-Followup-To: Leo Bicknell , Julian Elischer , Leo Bicknell , freebsd-hackers@freebsd.org References: <20010713101107.B9559@ussenterprise.ufp.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: ; from julian@elischer.org on Fri, Jul 13, 2001 at 01:14:07PM -0700 Organization: United Federation of Planets Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Fri, Jul 13, 2001 at 01:14:07PM -0700, Julian Elischer wrote: > I would suggest that 2 * the current window may be too small > because the window might be increasing and > reception of one ack might move the window up by > the entire transmitted window size, resulting in starvation > if the waiting data can be sent quickly. therefore I suggest a few > modifying factors: Actually, I doubt 2 * cwin would be too small, and here's my rational: * The majority of the "large increases" should be during slow start. These values should all be below the minimum buffer size, so there is no thrashing. Note, this requires a good minimum buffer size. * When dealing with large bandwidth*delay number (say, a 1 meg cross country 100Mbps path) we don't really want to buffer 3 meg, rather than 2 meg. In fact, I could question if we really want 2 meg, but it's an ok compromise for now. -- Leo Bicknell - bicknell@ufp.org Systems Engineer - Internetworking Engineer - CCIE 3440 Read TMBG List - tmbg-list-request@tmbg.org, www.tmbg.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message