Date: Mon, 01 Jul 2002 23:11:42 +0200 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Michael Sierchio <kudzu@tenebras.com> Cc: Doug Barton <DougB@FreeBSD.ORG>, freebsd-hackers@FreeBSD.ORG, net@FreeBSD.ORG Subject: Re: ftp and mail much slower into fbsd 4.4 vs and old BSDi Message-ID: <57969.1025557902@critter.freebsd.dk> In-Reply-To: Your message of "Mon, 01 Jul 2002 14:07:21 PDT." <3D20C489.5040108@tenebras.com>
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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
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