From owner-freebsd-hackers@FreeBSD.ORG Sat Sep 14 01:39:10 2013 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id 588CE92D; Sat, 14 Sep 2013 01:39:10 +0000 (UTC) (envelope-from rmacklem@uoguelph.ca) Received: from esa-annu.net.uoguelph.ca (esa-annu.mail.uoguelph.ca [131.104.91.36]) by mx1.freebsd.org (Postfix) with ESMTP id 8B6B92916; Sat, 14 Sep 2013 01:39:08 +0000 (UTC) X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AqIEAP+9M1KDaFve/2dsb2JhbABbgz9Sgyq9U4E1dIIlAQEEASNWBRYYAgINGQJZBgqIBgYMp2aRc4EpjhQ0B4JpgTUDhRWWbY1sg0AggW4 X-IronPort-AV: E=Sophos;i="4.90,902,1371096000"; d="scan'208";a="51799604" Received: from muskoka.cs.uoguelph.ca (HELO zcs3.mail.uoguelph.ca) ([131.104.91.222]) by esa-annu.net.uoguelph.ca with ESMTP; 13 Sep 2013 21:38:50 -0400 Received: from zcs3.mail.uoguelph.ca (localhost.localdomain [127.0.0.1]) by zcs3.mail.uoguelph.ca (Postfix) with ESMTP id 67F6EB404B; Fri, 13 Sep 2013 21:38:50 -0400 (EDT) Date: Fri, 13 Sep 2013 21:38:50 -0400 (EDT) From: Rick Macklem To: "Sam Fourman Jr." Message-ID: <1087948919.23486338.1379122730412.JavaMail.root@uoguelph.ca> In-Reply-To: Subject: Re: Network stack changes MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Originating-IP: [172.17.91.202] X-Mailer: Zimbra 7.2.1_GA_2790 (ZimbraWebClient - FF3.0 (Win)/7.2.1_GA_2790) X-Mailman-Approved-At: Sat, 14 Sep 2013 11:18:56 +0000 Cc: "Alexander V. Chernikov" , Luigi Rizzo , Andre Oppermann , freebsd-hackers@freebsd.org, George Neville-Neil , freebsd-arch@freebsd.org, Adrian Chadd , "Andrey V. Elsukov" , Gleb Smirnoff , FreeBSD Net X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 14 Sep 2013 01:39:10 -0000 Sam Fourman Jr. wrote: > > > > > And any time you increase latency, that will have a negative impact > > on > > NFS performance. NFS RPCs are usually small messages (except Write > > requests > > and Read replies) and the RTT for these (mostly small, > > bidirectional) > > messages can have a significant impact on NFS perf. > > > > rick > > > > > this may be a bit off topic but not much... I have wondered with all > of the > new > tcp algorithms > http://freebsdfoundation.blogspot.com/2011/03/summary-of-five-new-tcp-congestion.html > > what algorithm is best suited for NFS over gigabit Ethernet, say > FreeBSD to > FreeBSD. > and further more would a NFS optimized tcp algorithm be useful? > I have no idea what effect they might have. NFS traffic is quite different than streaming or bulk data transfer. I think this might make a nice research project for someone. rick > Sam Fourman Jr. >