From: Trond Myklebust Subject: Re: [PATCH 6/8] knfsd: repcache: use client IP address in hash Date: Wed, 11 Oct 2006 19:30:00 -0700 Message-ID: <1160620200.6596.36.camel@lade.trondhjem.org> References: <1160566130.8530.17.camel@hole.melbourne.sgi.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Cc: Neil Brown , Linux NFS Mailing List Return-path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.92] helo=mail.sourceforge.net) by sc8-sf-list2-new.sourceforge.net with esmtp (Exim 4.43) id 1GXqKw-0004Pk-UO for nfs@lists.sourceforge.net; Wed, 11 Oct 2006 19:30:19 -0700 Received: from pat.uio.no ([129.240.10.4] ident=7411) by mail.sourceforge.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.44) id 1GXqKw-0000om-II for nfs@lists.sourceforge.net; Wed, 11 Oct 2006 19:30:19 -0700 To: Greg Banks In-Reply-To: <1160566130.8530.17.camel@hole.melbourne.sgi.com> 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 On Wed, 2006-10-11 at 21:28 +1000, Greg Banks wrote: > knfsd: Use the client's IP address in the duplicate request cache > hash function, instead of just the XID. This avoids contention > on hash buckets when the workload has many clients whose XIDs are > nearly in lockstep, a property seen on compute clusters using NFS > for shared storage. Note that some platforms (in particular the *BSDs) use an MD5 checksum of the first couple of 100 bytes of the RPC header+message instead of relying on the XID. That is a good deal safer w.r.t. port reuse by other clients etc. Cheers, Trond ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs