Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262347AbVDFXTb (ORCPT ); Wed, 6 Apr 2005 19:19:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262348AbVDFXTb (ORCPT ); Wed, 6 Apr 2005 19:19:31 -0400 Received: from omx3-ext.sgi.com ([192.48.171.20]:17305 "EHLO omx3.sgi.com") by vger.kernel.org with ESMTP id S262347AbVDFXT2 (ORCPT ); Wed, 6 Apr 2005 19:19:28 -0400 Date: Thu, 7 Apr 2005 09:19:06 +1000 From: Greg Banks To: Jakob Oestergaard , linux-kernel@vger.kernel.org Subject: Re: bdflush/rpciod high CPU utilization, profile does not make sense Message-ID: <20050406231906.GA4473@sgi.com> References: <20050406160123.GH347@unthought.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20050406160123.GH347@unthought.net> User-Agent: Mutt/1.5.5.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 998 Lines: 25 On Wed, Apr 06, 2005 at 06:01:23PM +0200, Jakob Oestergaard wrote: > > Problem; during simple tests such as a 'cp largefile0 largefile1' on the > client (under the mountpoint from the NFS server), the client becomes > extremely laggy, NFS writes are slow, and I see very high CPU > utilization by bdflush and rpciod. > > For example, writing a single 8G file with dd will give me about > 20MB/sec (I get 60+ MB/sec locally on the server), and the client rarely > drops below 40% system CPU utilization. How large is the client's RAM? What does the following command report before and during the write? egrep 'nfs_page|nfs_write_data' /proc/slabinfo Greg. -- Greg Banks, R&D Software Engineer, SGI Australian Software Group. I don't speak for SGI. - 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/