From owner-freebsd-hackers Sat Jan 18 14:52:51 2003 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 1AB7237B401 for ; Sat, 18 Jan 2003 14:52:48 -0800 (PST) Received: from boreas.isi.edu (boreas.isi.edu [128.9.160.161]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4B78943F43 for ; Sat, 18 Jan 2003 14:52:47 -0800 (PST) (envelope-from larse@ISI.EDU) Received: from isi.edu (c-24-130-112-121.we.client2.attbi.com [24.130.112.121]) by boreas.isi.edu (8.11.6/8.11.2) with ESMTP id h0IMqSC03000; Sat, 18 Jan 2003 14:52:28 -0800 (PST) Message-ID: <3E29DAAC.5040707@isi.edu> Date: Sat, 18 Jan 2003 14:52:28 -0800 From: Lars Eggert Organization: USC Information Sciences Institute User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.3a) Gecko/20021212 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Terry Lambert Cc: Scott Mitchell , Jay Sern Liew , freebsd-hackers@FreeBSD.ORG Subject: Re: 5400RPM|7200RPM Cable bottleneck? References: <1042849118.3e289d5ee4458@webmail.americanhorizonsbank.com> <20030118105015.GB783@fishballoon.dyndns.org> <3E2998FD.1010904@isi.edu> <3E29D4D2.47A5E909@mindspring.com> In-Reply-To: <3E29D4D2.47A5E909@mindspring.com> Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms060002010406070302020008" 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 This is a cryptographically signed message in MIME format. --------------ms060002010406070302020008 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit On 1/18/2003 2:27 PM, Terry Lambert wrote: > Lars Eggert wrote: > >>I've tried NFS mounting ISI servers at home over PPTP over a cable modem >>connection, and it's painfully slow - much slower than the bandwidth of >>the cable pipe. NFS isn't well tuned for high-RTT environments (in my >>case, 20ms). > > The up-channel speed on a cable modem is usually in the > neighborhood of 1.5 times the amount of bandwidth needed > for just the ACKs for the data coming down the down-channel; > that leaves very little bandwidth left over for NFS requests > to the server, particularly if there are a lot of data > transfers taking place from the server to the client (client > reads). If you are doing any level of data transfers from > the client to the server (client writes), you should expect > your performance to go to hell. Both uplink and downlink bandwidths are nowhere near saturation - it's the underlying RPC that make NFS inherently slow over WAN links. 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