From owner-freebsd-hackers@FreeBSD.ORG Thu Sep 2 19:08:43 2004 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6469B16A4CE for ; Thu, 2 Sep 2004 19:08:43 +0000 (GMT) Received: from multiplay.co.uk (www1.multiplay.co.uk [212.42.16.7]) by mx1.FreeBSD.org (Postfix) with ESMTP id D437743D46 for ; Thu, 2 Sep 2004 19:08:42 +0000 (GMT) (envelope-from killing@multiplay.co.uk) Received: from vader ([212.135.219.180]) by multiplay.co.uk (multiplay.co.uk [212.42.16.7]) (MDaemon.PRO.v7.1.2.R) with ESMTP id md50000520383.msg for ; Thu, 02 Sep 2004 14:48:06 +0100 Message-ID: <015e01c490f4$3529ac40$b4db87d4@multiplay.co.uk> From: "Steven Hartland" To: Date: Thu, 2 Sep 2004 14:53:19 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Spam-Processed: multiplay.co.uk, Thu, 02 Sep 2004 14:48:06 +0100 (not processed: message from valid local sender) X-MDRemoteIP: 212.135.219.180 X-Return-Path: killing@multiplay.co.uk X-MDaemon-Deliver-To: freebsd-hackers@freebsd.org X-MDAV-Processed: multiplay.co.uk, Thu, 02 Sep 2004 14:48:07 +0100 Subject: Re: 5.2.1 netcard performance em slow vs fxp X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 02 Sep 2004 19:08:43 -0000 Just been testing a em ( gE ) netcard vs a old fxp in the same machine ( Dual PIII 800 ) and the em can't even match the fxp for throughput. Looking at sysstat the interrupt rate on em is virtually double that of the fxp 11K vs 5k. When testing with straight ftp from a 2.5Ghz P4 windows client using an em connected with a crossover cable I get: em = 8->9MB/s fxp = 10->11MB/s Tweaking the em to use jumbo packets I can push that to 14MB/s before the cpu on the P3 saturates. This is mainly interrupt and system time not user ( proftpd ) time. Unfortunately this doesn't really help because I'm after increased through put to multiple 100Mb clients not to one gE client hence jumbo frames is not an option. Is their anyway to tweak the em driver to give better performance. I would at least expect as good as the fxp if not substantially better. Steve ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone (023) 8024 3137 or return the E.mail to postmaster@multiplay.co.uk.