From mboxrd@z Thu Jan 1 00:00:00 1970 From: "David B. Ritch" Subject: Re: mmap() and NFS server performance Date: 14 Dec 2002 11:51:23 -0500 Sender: nfs-admin@lists.sourceforge.net Message-ID: <1039884683.2767.29.camel@localhost> References: <3DFA4C9A.50101@geodev.com> Mime-Version: 1.0 Content-Type: text/plain Cc: NFS mailing list Return-path: Received: from pcp234914pcs.elictc01.md.comcast.net ([68.55.182.99] helo=localhost.localdomain) by sc8-sf-list1.sourceforge.net with esmtp (Exim 3.31-VA-mm2 #1 (Debian)) id 18NFXM-00082e-00 for ; Sat, 14 Dec 2002 08:53:12 -0800 To: Matthew Mitchell In-Reply-To: <3DFA4C9A.50101@geodev.com> Errors-To: nfs-admin@lists.sourceforge.net List-Help: List-Post: List-Subscribe: , List-Id: Discussion of NFS under Linux development, interoperability, and testing. List-Unsubscribe: , List-Archive: When we moved some nfs clients from 2.4.18 to 2.4.20, we saw some performance issues that initially appeared to be an nfs problem. However, it turned out that the upgrade apparently broke autonegotiation between the NICs in the nodes and our network switches. This did not turn up immediately in network testing with tools such as netperf, because we still had good one-way bandwidth with the nodes set to full duplex and the switches set to half. However, two-way traffic immediately caused lots of problems. I never trust autonegotiation, and turn it off whenever I can. You may be experiencing a similar problem. dbr On Fri, 2002-12-13 at 16:09, Matthew Mitchell wrote: > Hello, > > We've noticed some interesting behavior regarding mmap file IO and were > wondering if anyone here had some clues as to what might be going on. -- David B. Ritch High Performance Technologies, Inc. ------------------------------------------------------- This sf.net email is sponsored by: With Great Power, Comes Great Responsibility Learn to use your power at OSDN's High Performance Computing Channel http://hpc.devchannel.org/ _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs