From owner-freebsd-current@FreeBSD.ORG Fri Nov 19 16:57:49 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id D8A5916A4CE for ; Fri, 19 Nov 2004 16:57:49 +0000 (GMT) Received: from bizet.nethelp.no (bizet.nethelp.no [195.1.209.33]) by mx1.FreeBSD.org (Postfix) with SMTP id 4FD5943D58 for ; Fri, 19 Nov 2004 16:57:48 +0000 (GMT) (envelope-from sthaug@nethelp.no) Received: (qmail 79376 invoked by uid 1001); 19 Nov 2004 16:57:46 -0000 To: Emanuel.Strobl@gmx.net From: sthaug@nethelp.no In-Reply-To: Your message of "Fri, 19 Nov 2004 13:18:40 +0100" References: <200411191318.46405.Emanuel.Strobl@gmx.net> X-Mailer: Mew version 1.05+ on Emacs 19.34.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Date: Fri, 19 Nov 2004 17:57:46 +0100 Message-ID: <79374.1100883466@bizet.nethelp.no> cc: freebsd-current@freebsd.org cc: freebsd-stable@freebsd.org Subject: Re: serious networking (em) performance (ggate and NFS) problem X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Nov 2004 16:57:50 -0000 > I changed cables and couldn't reproduce that bad results so I changed cables > back but also cannot reproduce them, especially the ggate write, formerly > with 2,6MB/s now performs at 15MB/s, but I haven't done any polling tests > anymore, just interrupt driven, since Matt explained that em doesn't benefit > of polling in any way. > > Results don't indicate a serious problem now but are still about a third of > what I'd expected with my hardware. Do I really need Gigahertz Class CPUs to > transfer 30MB/s over GbE? I would be highly surprised if you did. When I tested this a while ago (around FreeBSD 4.8) with a pair of Intel ISP 1100 1U servers using Pentium 700 and Intel GigE cards (em driver), I was able to get around 700 Mbps using ttcp. This was done with a normal 32 bit 33 MHz PCI bus. Steinar Haug, Nethelp consulting, sthaug@nethelp.no