Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-ig0-f179.google.com ([209.85.213.179]:54221 "EHLO mail-ig0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751077AbaGGQYm (ORCPT ); Mon, 7 Jul 2014 12:24:42 -0400 Received: by mail-ig0-f179.google.com with SMTP id uq10so4553054igb.6 for ; Mon, 07 Jul 2014 09:24:42 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: References: Date: Mon, 7 Jul 2014 18:24:41 +0200 Message-ID: Subject: Re: NFSv4 delegations criteria? Fwd: Tuning Linux NFSv4 for high latency connections? From: Cedric Blancher To: Linux NFS Mailing List Content-Type: text/plain; charset=UTF-8 Sender: linux-nfs-owner@vger.kernel.org List-ID: Anyone? Ced On 23 April 2014 23:03, Cedric Blancher wrote: > What are the criteria for grating a file delegation in NFSv4? Are file > delegations retained even if a process closes a file and the next > process in the chain opens it again (e.g. in a shell script)? > > Ced > > PS: Who again grants NFSv4 delegations? Server or client? Do > delegations work when data are appended at the end of a file? > > ---------- Forwarded message ---------- > From: Cedric Blancher > Date: 23 April 2014 20:01 > Subject: Tuning Linux NFSv4 for high latency connections? > To: Linux NFS Mailing List > > > Are there any options to improve the Linux NFSv4 performance over a > high latency connection? > > We currently use Solaris/Illumos as NFSv4 server and client over a > cross continental Internet connection. Latency is terrible (~220ms) > but the counter this by running work in parallel so the latency is > mostly mitigated. > > We now wish to migrate (short: Away from Oracle because support is > basically unbearable) to Linux (tested SuSE 13.1 and current Fedora) > and build times are 17 times (!!!) SLOWER than on Solaris/Illumos. > > Are there any tunables besides actimeo=300? > > Ced > -- > Cedric Blancher > Institute Pasteur > > > -- > Cedric Blancher > Institute Pasteur -- Cedric Blancher Institute Pasteur