From owner-freebsd-net@freebsd.org Sun Apr 15 13:36:30 2018 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id C5659F933C7 for ; Sun, 15 Apr 2018 13:36:30 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from hz.grosbein.net (hz.grosbein.net [78.47.246.247]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 334B46D508 for ; Sun, 15 Apr 2018 13:36:29 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from eg.sd.rdtc.ru (root@eg.sd.rdtc.ru [62.231.161.221] (may be forged)) by hz.grosbein.net (8.15.2/8.15.2) with ESMTPS id w3FDaLng036471 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 15 Apr 2018 15:36:22 +0200 (CEST) (envelope-from eugen@grosbein.net) X-Envelope-From: eugen@grosbein.net X-Envelope-To: rmacklem@uoguelph.ca Received: from [10.58.0.4] ([10.58.0.4]) by eg.sd.rdtc.ru (8.15.2/8.15.2) with ESMTPS id w3FDaHrh067363 (version=TLSv1.2 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT); Sun, 15 Apr 2018 20:36:17 +0700 (+07) (envelope-from eugen@grosbein.net) Subject: Re: High rate of NFS cache misses after upgrading from 10.3-prerelease to 11.1-release To: Rick Macklem , Niels Kobschaetzki References: <36907CE0-EAD3-4E11-8023-5BCEA1239813@kobschaetzki.net> Cc: "freebsd-net@freebsd.org" From: Eugene Grosbein Message-ID: <5AD3554C.8030906@grosbein.net> Date: Sun, 15 Apr 2018 20:36:12 +0700 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.7.2 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=2.2 required=5.0 tests=BAYES_00, LOCAL_FROM, RDNS_NONE autolearn=no autolearn_force=no version=3.4.1 X-Spam-Report: * -2.3 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * 2.6 LOCAL_FROM From my domains * 1.9 RDNS_NONE Delivered to internal network by a host with no rDNS X-Spam-Level: ** X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on hz.grosbein.net X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Apr 2018 13:36:30 -0000 15.04.2018 19:58, Rick Macklem wrote: > Niels Kobschaetzki wrote: > [stuff snipped] >> It is a website with quite some traffic handles by three webservers behind a pair >of loadbalancers. >> We see a loss of 20% in speed(TTFB reduced by 100ms; sounds not a lot but >Google et al doesn’t like it at all) after upgrading to 11.1 with a combined upgrade >to php7.1. On another server without NFS that upgrade improved performance >considerably (I was told ca 30% by the front end-dev) > One thing you could try is booting the 11.1 kernel on an 10.3 system. Newer > FreeBSD kernels should work with older userland. Though one should remember that some important system utilities may and probably will not work with newer kernel, like /sbin/ipfw, route, ifconfig, netstat etc. > This would tell you if it is kernel changes or userland changes that are causing > the higher miss rate.