From owner-freebsd-current@FreeBSD.ORG Mon Sep 4 08:19:51 2006 Return-Path: X-Original-To: freebsd-current@FreeBSD.org 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 61D6C16A4F1 for ; Mon, 4 Sep 2006 08:19:51 +0000 (UTC) (envelope-from glebius@FreeBSD.org) Received: from cell.sick.ru (cell.sick.ru [217.72.144.68]) by mx1.FreeBSD.org (Postfix) with ESMTP id 971BD43D53 for ; Mon, 4 Sep 2006 08:19:42 +0000 (GMT) (envelope-from glebius@FreeBSD.org) Received: from cell.sick.ru (glebius@localhost [127.0.0.1]) by cell.sick.ru (8.13.4/8.13.3) with ESMTP id k848Jdnc081276 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Mon, 4 Sep 2006 12:19:39 +0400 (MSD) (envelope-from glebius@FreeBSD.org) Received: (from glebius@localhost) by cell.sick.ru (8.13.4/8.13.1/Submit) id k848JdtB081275; Mon, 4 Sep 2006 12:19:39 +0400 (MSD) (envelope-from glebius@FreeBSD.org) X-Authentication-Warning: cell.sick.ru: glebius set sender to glebius@FreeBSD.org using -f Date: Mon, 4 Sep 2006 12:19:38 +0400 From: Gleb Smirnoff To: "Derrick T. Woolworth" Message-ID: <20060904081938.GX40020@FreeBSD.org> References: <10fd06c60609031846x60c40383iaee659aa7ee74300@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=koi8-r Content-Disposition: inline In-Reply-To: <10fd06c60609031846x60c40383iaee659aa7ee74300@mail.gmail.com> User-Agent: Mutt/1.5.6i Cc: freebsd-current@FreeBSD.org Subject: Re: Jumbo Frames with em X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 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: Mon, 04 Sep 2006 08:19:51 -0000 On Sun, Sep 03, 2006 at 08:46:21PM -0500, Derrick T. Woolworth wrote: D> I'm running -current on a NFS file server with a 3ware controller D> striping across multiple disks. The box uses the em driver with the D> mtu set to 8192 - client machines connecting via NFS that are also D> running -current with bge drivers with the mtu set to 8192 (and jumbo D> frames enabled on the switch)... D> D> The em driver's README says that UDP and Jumbo Frames don't play well D> together - just wondering if this would have any impact on NFS over D> TCP? This comment is quite old. It may happen that this isn't true anymore. May be developers from Intel will comment on this. D> Does anyone know anything about the future of the em driver or D> bge driver that might have performance issues with Jumbo Frames? D> D> I'm only ever seeing the storage system write about 10 to 15MB (bytes) D> per second over NFS. Have you tested the performance with ftp, netcat or some network benchmarking tool? The problem may be in NFS not in driver. -- Totus tuus, Glebius. GLEBIUS-RIPN GLEB-RIPE