From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753548Ab1BEUjL (ORCPT ); Sat, 5 Feb 2011 15:39:11 -0500 Received: from mo-65-41-216-221.sta.embarqhsd.net ([65.41.216.221]:39259 "EHLO greer.hardwarefreak.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752104Ab1BEUjJ (ORCPT ); Sat, 5 Feb 2011 15:39:09 -0500 Message-ID: <4D4DB56B.9020806@hardwarefreak.com> Date: Sat, 05 Feb 2011 14:39:07 -0600 From: Stan Hoeppner User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9.2.13) Gecko/20101207 Thunderbird/3.1.7 MIME-Version: 1.0 To: Justin Piszcz CC: Jean Gobin , 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? References: <1296934967.2599.2.camel@jeff-ubuntu> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Justin Piszcz put forth on 2/5/2011 2:18 PM: > Everything > 1 Gbyte/sec but when you use the network, 250MiB/s, it does not > make sense. Did you try launching 4 simultaneous cp operations over nfs to get to 1.2 GB/s? I've witnessed single stream copy performance with Samba being less than maximum due to Samba limitations. Running multiple copy ops in parallel then usually saturates the pipe. I'm thinking you may have a single threaded process involved that's eating all of one core, at which point there is no scalability left for that operation. -- Stan