From: Tom Tucker Subject: Re: [RFC,PATCH 11/15] knfsd: RDMA transport core Date: Wed, 23 May 2007 10:12:03 -0500 Message-ID: <1179933123.9389.157.camel@trinity.ogc.int> References: <1179510352.23385.123.camel@trinity.ogc.int> <20070518192443.GD4843@fieldses.org> <1179516988.23385.171.camel@trinity.ogc.int> <20070523140901.GG14076@sgi.com> <1179931410.9389.144.camel@trinity.ogc.int> <20070523145557.GN14076@sgi.com> <1179932586.6480.53.camel@heimdal.trondhjem.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Cc: Tom Talpey , Greg Banks , Neil Brown , Peter Leckie , "J. Bruce Fields" , Linux NFS Mailing List To: Trond Myklebust 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 1HqsVS-0000Wf-8n for nfs@lists.sourceforge.net; Wed, 23 May 2007 08:12:09 -0700 Received: from rrcs-71-42-183-126.sw.biz.rr.com ([71.42.183.126] helo=smtp.opengridcomputing.com) by mail.sourceforge.net with esmtp (Exim 4.44) id 1HqsVU-0008D6-UZ for nfs@lists.sourceforge.net; Wed, 23 May 2007 08:12:09 -0700 In-Reply-To: <1179932586.6480.53.camel@heimdal.trondhjem.org> 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 Ah, this is a very good point. So then I think we need a transport specific deferral mechanism. On Wed, 2007-05-23 at 11:03 -0400, Trond Myklebust wrote: > On Thu, 2007-05-24 at 00:55 +1000, Greg Banks wrote: > > Currently neither svc_defer() nor svc_rdma_defer() support calls longer > > than just the head, meaning that WRITE RPCs (only) are dropped and > > retried instead of deferred. This doesn't seem to be too much of a > > problem; deferral happens so infrequently anyway. > > That still isn't a good tactic. > > On NFSv4, dropping a request requires the server to also drop the > connection. Unless you are completely out of resources, you are > inevitably better off having the server return an NFS4ERR_DELAY or > something like that. > > Trond > ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs