Return-Path: linux-nfs-owner@vger.kernel.org Received: from e8.ny.us.ibm.com ([32.97.182.138]:53825 "EHLO e8.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755714AbaDWUYH (ORCPT ); Wed, 23 Apr 2014 16:24:07 -0400 Received: from /spool/local by e8.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 23 Apr 2014 16:24:06 -0400 Received: from b01cxnp22035.gho.pok.ibm.com (b01cxnp22035.gho.pok.ibm.com [9.57.198.25]) by d01dlp02.pok.ibm.com (Postfix) with ESMTP id 68C606E801C for ; Wed, 23 Apr 2014 16:23:56 -0400 (EDT) Received: from d01av01.pok.ibm.com (d01av01.pok.ibm.com [9.56.224.215]) by b01cxnp22035.gho.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id s3NKO3BC8192090 for ; Wed, 23 Apr 2014 20:24:03 GMT Received: from d01av01.pok.ibm.com (localhost [127.0.0.1]) by d01av01.pok.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id s3NKO2Lw029602 for ; Wed, 23 Apr 2014 16:24:03 -0400 Date: Wed, 23 Apr 2014 15:24:01 -0500 From: Malahal Naineni To: Cedric Blancher Cc: Linux NFS Mailing List Subject: Re: Tuning Linux NFSv4 for high latency connections? Message-ID: <20140423202401.GA16168@us.ibm.com> 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 [cedric.blancher@gmail.com] wrote: > 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? rsize and wsize may help! You need to figure out if the read is the issue or the write before you dig further. Regards, Malahal.