From owner-freebsd-net Wed Jan 24 11:50:35 2001 Delivered-To: freebsd-net@freebsd.org Received: from mail2.netcologne.de (mail2.netcologne.de [194.8.194.103]) by hub.freebsd.org (Postfix) with ESMTP id 218E237B404 for ; Wed, 24 Jan 2001 11:50:16 -0800 (PST) Received: from husten.security.at12.de (dial-195-14-244-56.netcologne.de [195.14.244.56]) by mail2.netcologne.de (8.9.3/8.9.3) with ESMTP id UAA19178; Wed, 24 Jan 2001 20:50:14 +0100 (MET) Received: from localhost (localhost.security.at12.de [127.0.0.1]) by husten.security.at12.de (8.11.1/8.11.1) with ESMTP id f0OJo6X15418; Wed, 24 Jan 2001 20:50:06 +0100 (CET) (envelope-from pherman@frenchfries.net) Date: Wed, 24 Jan 2001 20:50:06 +0100 (CET) From: Paul Herman To: Jonathan Lemon Cc: Subject: Re: I have delayed ACK problems In-Reply-To: <200101241721.f0OHL2627523@prism.flugsvamp.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Hi Jonathan, On Wed, 24 Jan 2001, Jonathan Lemon wrote: > >10:49:54.279497 16.1035 > 10.40438: . ack 19433 win 17520 (DF) > >10:49:54.371025 16.1035 > 10.40438: . ack 21481 win 17520 (DF) > > Are you sure the trace has delayed ack turned off? Sorry, wasn't clear there. Yes, this trace is with delayed acks turned ON, exhibiting the performance problems I was describing. > Try bumping up net.inet.tcp.slowstart_flightsize, which specifies > how many packets can be outstanding (unacked) at the beginning > of a TCP connection. Do you mean lower? Then it wouldn't wait for more segments to arrive and run up the delayed ack timer, correct? Thanks, I'll try it out (both ways, higher & lower values) but this unfortunately seems like a workaround rather than a solution. Something just doesn't sit well me. This shouldn't happen in a 100Mbit LAN. This seems like a plain vanilla network transaction, and FreeBSD is failing on something, where other OSes in the same environment don't. Time to dig through sys/netinet/tcp* ... -Paul. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message