Return-Path: linux-nfs-owner@vger.kernel.org Received: from mout.perfora.net ([74.208.4.194]:54121 "EHLO mout.perfora.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751478AbaDXDM0 (ORCPT ); Wed, 23 Apr 2014 23:12:26 -0400 Date: Wed, 23 Apr 2014 23:12:16 -0400 From: Jim Rees To: Cedric Blancher Cc: Linux NFS Mailing List Subject: Re: Tuning Linux NFSv4 for high latency connections? Message-ID: <20140424031216.GA18817@umich.edu> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: Sender: linux-nfs-owner@vger.kernel.org List-ID: Cedric Blancher wrote: Are there any options to improve the Linux NFSv4 performance over a high latency connection? We did some work along these lines at CITI years ago. As I remember, the main thing was to increase net.ipv4.tcp_[rw]mem on the server side, because tcp auto-tuning was being defeated. This may be less of an issue with your work load, which sounds like many small files rather than one big one. In theory, NFSv4 delegations should help, but I don't know how well that works.