From owner-freebsd-hackers Mon Jul 1 14:14: 1 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 9EF4E37B400; Mon, 1 Jul 2002 14:13:56 -0700 (PDT) Received: from critter.freebsd.dk (critter.freebsd.dk [212.242.86.163]) by mx1.FreeBSD.org (Postfix) with ESMTP id D301443E0A; Mon, 1 Jul 2002 14:13:55 -0700 (PDT) (envelope-from phk@critter.freebsd.dk) Received: from critter.freebsd.dk (localhost [127.0.0.1]) by critter.freebsd.dk (8.12.3/8.12.2) with ESMTP id g61LBg6I057970; Mon, 1 Jul 2002 23:11:42 +0200 (CEST) (envelope-from phk@critter.freebsd.dk) To: Michael Sierchio Cc: Doug Barton , freebsd-hackers@FreeBSD.ORG, net@FreeBSD.ORG Subject: Re: ftp and mail much slower into fbsd 4.4 vs and old BSDi In-Reply-To: Your message of "Mon, 01 Jul 2002 14:07:21 PDT." <3D20C489.5040108@tenebras.com> Date: Mon, 01 Jul 2002 23:11:42 +0200 Message-ID: <57969.1025557902@critter.freebsd.dk> From: Poul-Henning Kamp 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 In message <3D20C489.5040108@tenebras.com>, Michael Sierchio writes: >Poul-Henning Kamp wrote: > >> Yes, I can attest to this an I belive it is actually the case on both >> -current and -releng4 that disabling newreno improves TCP performance. >> >> I belive running an X11 application or scp(1) over a wavelan is a very >> good test-bed for this issue. > >Wireless breaks a lot of "optimizations," doesn't it? Congestion control >assumes that packet loss is due to congestion, and less than 1% of loss >is due to damage -- quite the opposite of 802.11(b) in an urban >environment -- cordless phones, microwaves, etc. newreno is not sold as being a significant pessimization in some cases. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message