From: Gerd Bavendiek Subject: Differences between 2.6.5 und 2.6.16: getattr with actimeo=0 and O_DIRECT Date: Tue, 13 Nov 2007 10:03:42 +0100 Message-ID: <4739686E.8080501@googlemail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" To: nfs@lists.sourceforge.net Return-path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.91] helo=mail.sourceforge.net) by sc8-sf-list2-new.sourceforge.net with esmtp (Exim 4.43) id 1IrrgP-0005VG-H4 for nfs@lists.sourceforge.net; Tue, 13 Nov 2007 01:03:45 -0800 Received: from ug-out-1314.google.com ([66.249.92.174]) by mail.sourceforge.net with esmtp (Exim 4.44) id 1IrrgV-0005d4-3a for nfs@lists.sourceforge.net; Tue, 13 Nov 2007 01:03:51 -0800 Received: by ug-out-1314.google.com with SMTP id m2so50845uge for ; Tue, 13 Nov 2007 01:03:48 -0800 (PST) List-Id: "Discussion of NFS under Linux development, interoperability, and testing." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: nfs-bounces@lists.sourceforge.net Errors-To: nfs-bounces@lists.sourceforge.net Hi, analyzing performance issues with Oracle databases on an NFS client running on SLES9 SP3 and NetApp as NFS server, I found that in SLES9 SP3 each write call is followed by an getattr. This is not the case with SLES10 SP1. Mount options in use are: rw,v3,rsize=32768,wsize=32768,acregmin=0,acregmax=0,acdirmin=0,acdirmax=0,hard,lock,proto=tcp,addr=172.18.131.134 I do dd if=/dev/zero of=/mnt/qqq oflag=direct bs=8k count=100000 and using tcpdump (BTW, is there an easier way ?) I see with SLES9 SP3 (i.e. 2.6.5-7.244) each single 8k write followed by an getattr (which comes at some cost). Using SLES10 SP1 (2.6.16.46-0.12) there is only one getattr when dd closes the file. Is there anything I can do to avoid the getattr calls in SLES9 SP3 (no, sorry, can't update to SLES10 SP1) ? Thanks Gerd ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs