From owner-freebsd-net@FreeBSD.ORG Wed Apr 29 06:27:46 2015 Return-Path: Delivered-To: freebsd-net@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 031D51BC for ; Wed, 29 Apr 2015 06:27:46 +0000 (UTC) Received: from gold.funkthat.com (gate2.funkthat.com [208.87.223.18]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "gold.funkthat.com", Issuer "gold.funkthat.com" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id B6FB21FC0 for ; Wed, 29 Apr 2015 06:27:45 +0000 (UTC) Received: from gold.funkthat.com (localhost [127.0.0.1]) by gold.funkthat.com (8.14.5/8.14.5) with ESMTP id t3T6RSOC001752 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 28 Apr 2015 23:27:28 -0700 (PDT) (envelope-from jmg@gold.funkthat.com) Received: (from jmg@localhost) by gold.funkthat.com (8.14.5/8.14.5/Submit) id t3T6RSCL001751; Tue, 28 Apr 2015 23:27:28 -0700 (PDT) (envelope-from jmg) Date: Tue, 28 Apr 2015 23:27:28 -0700 From: John-Mark Gurney To: Garrett Wollman , Rick Macklem , freebsd-net@FreeBSD.org, Mark Schouten Subject: Re: Frequent hickups on the networking layer Message-ID: <20150429062728.GI37063@funkthat.com> References: <4281350517-9417@kerio.tuxis.nl> <137094161.27589033.1430255162390.JavaMail.root@uoguelph.ca> <21824.26416.855441.21454@hergotha.csail.mit.edu> <20150429051659.GA2180@nparhar-pc> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150429051659.GA2180@nparhar-pc> X-Operating-System: FreeBSD 9.1-PRERELEASE amd64 X-PGP-Fingerprint: 54BA 873B 6515 3F10 9E88 9322 9CB1 8F74 6D3F A396 X-Files: The truth is out there X-URL: http://resnet.uoregon.edu/~gurney_j/ X-Resume: http://resnet.uoregon.edu/~gurney_j/resume.html X-TipJar: bitcoin:13Qmb6AeTgQecazTWph4XasEsP7nGRbAPE X-to-the-FBI-CIA-and-NSA: HI! HOW YA DOIN? can i haz chizburger? User-Agent: Mutt/1.5.21 (2010-09-15) X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7 (gold.funkthat.com [127.0.0.1]); Tue, 28 Apr 2015 23:27:29 -0700 (PDT) X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 29 Apr 2015 06:27:46 -0000 Navdeep Parhar wrote this message on Tue, Apr 28, 2015 at 22:16 -0700: > On Wed, Apr 29, 2015 at 01:08:00AM -0400, Garrett Wollman wrote: > > < said: > ... > > > As far as I know (just from email discussion, never used them myself), > > > you can either stop using jumbo packets or switch to a different net > > > interface that doesn't allocate 9K jumbo mbufs (doing the receives of > > > jumbo packets into a list of smaller mbuf clusters). > > > > Or just hack the driver to not use them. For the Intel drivers this > > is easy, and at least for the hardware I have there's no benefit to > > using 9k clusters over 4k; for Chelsio it's quite a bit harder. > > Quite a bit harder, and entirely unnecessary these days. Recent > versions of the Chelsio driver will fall back to 4K clusters > automatically (and on the fly) if the system is short of 9K clusters. > There are even tunables that will let you set 4K as the only cluster > size that the driver should allocate. Can we get this to be the default? and included in more drivers too? -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not."