Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932478AbWCFXk7 (ORCPT ); Mon, 6 Mar 2006 18:40:59 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932479AbWCFXk7 (ORCPT ); Mon, 6 Mar 2006 18:40:59 -0500 Received: from sj-iport-3-in.cisco.com ([171.71.176.72]:42307 "EHLO sj-iport-3.cisco.com") by vger.kernel.org with ESMTP id S932478AbWCFXk6 (ORCPT ); Mon, 6 Mar 2006 18:40:58 -0500 X-IronPort-AV: i="4.02,169,1139212800"; d="scan'208"; a="412929648:sNHT33254660" To: "David S. Miller" Cc: mshefty@ichips.intel.com, sean.hefty@intel.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, openib-general@openib.org Subject: Re: [openib-general] Re: [PATCH 6/6] IB: userspace support for RDMA connection manager X-Message-Flag: Warning: May contain useful information References: <20060306.143901.26500391.davem@davemloft.net> <20060306.145053.129802994.davem@davemloft.net> From: Roland Dreier Date: Mon, 06 Mar 2006 15:40:56 -0800 In-Reply-To: <20060306.145053.129802994.davem@davemloft.net> (David S. Miller's message of "Mon, 06 Mar 2006 14:50:53 -0800 (PST)") Message-ID: User-Agent: Gnus/5.1007 (Gnus v5.10.7) XEmacs/21.4.18 (linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-OriginalArrivalTime: 06 Mar 2006 23:40:57.0692 (UTC) FILETIME=[6AE4A1C0:01C64177] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1401 Lines: 32 Roland> I should look into getting some niagara machines to test Roland> with -- with PCIe slots they should actually be good for Roland> IB testing. David> You'll be cpu limited until we have Van Jacobson net David> channels. For IPoIB maybe but not for native IB which offloads all transport to the HCA... I'd be surprised if the bottleneck were anywhere other than the bus, even on niagara. David> Also, since our existing Linux "generic" MSI code is so David> riddled with x86'isms (it was written by an Intel person, David> so this is just the status quo), it will be a while before David> MSI interrupts are supported on sparc64. Yeah, I've always wanted to make the MSI stuff generic and handle the embedded ppc chips that have MSI, but I've never had a good enough reason to really work on it -- it's just been at the level of "that would be fun." Now that IBM cares I hope it will get done soon. Anyway IB works fine with standard INTx interrupts -- MSI is just icing. The Niagara boxes seem like a fun toy if I can get budget for it -- and 32 threads are probably good for flushing out SMP races. - R. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/