Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753735Ab1BEUrI (ORCPT ); Sat, 5 Feb 2011 15:47:08 -0500 Received: from smtp3-g21.free.fr ([212.27.42.3]:50659 "EHLO smtp3-g21.free.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753431Ab1BEUrG convert rfc822-to-8bit (ORCPT ); Sat, 5 Feb 2011 15:47:06 -0500 Date: Sat, 5 Feb 2011 21:45:50 +0100 From: Emmanuel Florac To: Justin Piszcz Cc: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-net@vger.kernel.org, Alan Piszcz Subject: Re: Supermicro X8DTH-6: Only ~250MiB/s from RAID<->RAID over 10GbE? Message-ID: <20110205214550.3cb0f0d1@galadriel2.home> In-Reply-To: References: Organization: Intellique X-Mailer: Claws Mail 3.7.8 (GTK+ 2.20.1; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1006 Lines: 24 Le Sat, 5 Feb 2011 14:35:52 -0500 (EST) vous écriviez: > No single component is < 1Gbyte/sec but when data is transferred from > hostA to hostB, then it degrades to 250MiB/s. Running 2 Supermicro H8-DIi+ with 2378 Opteron, Intel 10 GigE CX4, 3Ware RAID-6 24 drives : 550 MB/s reading sustained over NFS with 2.6.32.* (plain vanilla kernel). I know that Xeon used to suck IO wise, but this is surprising. Isn't something preventing DMA ? -- ------------------------------------------------------------------------ Emmanuel Florac | Direction technique | Intellique | | +33 1 78 94 84 02 ------------------------------------------------------------------------ -- 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/