From owner-freebsd-hackers Fri Nov 30 9:46:26 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from ns.yogotech.com (ns.yogotech.com [206.127.123.66]) by hub.freebsd.org (Postfix) with ESMTP id 040D737B417; Fri, 30 Nov 2001 09:46:19 -0800 (PST) Received: from caddis.yogotech.com (caddis.yogotech.com [206.127.123.130]) by ns.yogotech.com (8.9.3/8.9.3) with ESMTP id KAA08175; Fri, 30 Nov 2001 10:45:57 -0700 (MST) (envelope-from nate@yogotech.com) Received: (from nate@localhost) by caddis.yogotech.com (8.11.6/8.11.6) id fAUHjuJ18966; Fri, 30 Nov 2001 10:45:56 -0700 (MST) (envelope-from nate) From: Nate Williams MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <15367.50644.710575.213155@caddis.yogotech.com> Date: Fri, 30 Nov 2001 10:45:56 -0700 To: Matthew Dillon Cc: David Malone , Nate Williams , Greg Lehey , developers@FreeBSD.org, FreeBSD Hackers Subject: Re: FreeBSD performing worse than Linux? In-Reply-To: <200111301030.fAUAUUS09410@apollo.backplane.com> References: <20011128153817.T61580@monorchid.lemis.com> <15364.38174.938500.946169@caddis.yogotech.com> <20011128104629.A43642@walton.maths.tcd.ie> <200111301030.fAUAUUS09410@apollo.backplane.com> X-Mailer: VM 6.96 under 21.1 (patch 14) "Cuyahoga Valley" XEmacs Lucid Reply-To: nate@yogotech.com (Nate Williams) 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 > :> FWIW, I'm seeing this as well. However, this appears to be a new > :> occurance, as we were using a FreeBSD 3.X system for our reference test > :> platform. > : > :Someone recently submitted a PR about TCP based NFS being significantly > :slower under 4.X. I wonder if it could be related? > : > : http://www.freebsd.org/cgi/query-pr.cgi?pr=misc/32141 > : > :There is quite a lot of detail in the PR and the submitter has no > :trouble reproducing the problem. > : > : David. > > Hmm. I'll play with it a bit tomorrow. Er, later today. One thing > I noticed recently with NFS/TCP is that I have to run 'nfsiod -n 4' > on the client to get reasonable TCP performance. I don't think I > had to do that before. It sure sounds similar... like a delayed-ack > problem or improper transmit side backoff. > > It would be nice if someone able to reproduce the problem can test > the TCP connection with newreno turned off (net.inet.tcp.newreno) > and delayed acks turned off (net.inet.tcp.delayed_ack). If that > fixes the proble it narrows down our search considerably. John Capo replied that turning off both did not help his setup any. I was supposed to be testing things yesterday, but the guys got pulled away on another project. Perhaps today I'll get a chance to get some tcpdump's and some more test data. Nate To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message