From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id q6VNkQeP225590 for ; Tue, 31 Jul 2012 18:46:26 -0500 Received: from greer.hardwarefreak.com (mo-65-41-216-221.sta.embarqhsd.net [65.41.216.221]) by cuda.sgi.com with ESMTP id Y5JP1yfG1AvtbTYb for ; Tue, 31 Jul 2012 16:46:24 -0700 (PDT) Message-ID: <50186E51.1020107@hardwarefreak.com> Date: Tue, 31 Jul 2012 18:46:25 -0500 From: Stan Hoeppner MIME-Version: 1.0 Subject: Re: realtime section bugs still around References: <20120730030333.GE2877@dastard> In-Reply-To: Reply-To: stan@hardwarefreak.com List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: Jason Newton Cc: xfs@oss.sgi.com On 7/31/2012 6:01 PM, Jason Newton wrote: > I'm still interested in finding out why streaming a few hundred MB to disk > has so much over head in comparison to the calculations I do in userspace, 1. md eats a lot of cycles at high data rates 2. ATA overhead 3. IRQ/MSI overhead 4. Etc. All these small bits add up to more than negligible CPU overhead at high data rates. -- Stan _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs