Return-Path: Received: from mb2.zcs.datasyncintra.net ([208.88.241.40]:43917 "EHLO mb2.zcs.datasyncintra.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753674Ab0KCSIx (ORCPT ); Wed, 3 Nov 2010 14:08:53 -0400 Received: from localhost (localhost [127.0.0.1]) by mb2.zcs.datasyncintra.net (Postfix) with ESMTP id B30C5BE079 for ; Wed, 3 Nov 2010 12:58:02 -0500 (CDT) Received: from mb2.zcs.datasyncintra.net ([127.0.0.1]) by localhost (mb2.zcs.datasyncintra.net [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5OQQQLmSfu86 for ; Wed, 3 Nov 2010 12:58:02 -0500 (CDT) Received: from mb2.zcs.datasyncintra.net (mb2.zcs.datasyncintra.net [172.16.0.67]) by mb2.zcs.datasyncintra.net (Postfix) with ESMTP id 1B6D4BE073 for ; Wed, 3 Nov 2010 12:58:02 -0500 (CDT) Date: Wed, 3 Nov 2010 11:58:02 -0600 (CST) From: Shehjar Tikoo To: linux-nfs@vger.kernel.org Message-ID: <766909857.700951.1288807081999.JavaMail.root@mb2> Subject: Streaming perf problem on 10g Content-Type: text/plain; charset=utf-8 Sender: linux-nfs-owner@vger.kernel.org List-ID: MIME-Version: 1.0 Hi All, I am running into a performance problem with 2.6.32-23 Ubuntu lucid on both client and server. The disk is an SSD performing at 1.4 - 1.6Gbps for a dd of a 6gb file in 64k blocks. The network is performing fine with many Gbps of iperf throughput. Yet, the dd write performance over the nfs mount point ranges from 96-105 Mbps for a 6gb file in 64k blocks. I've tried changing the tcp_slot_table_entries and the wsize but there is negligible gain from these. Does it sound like a client side inefficiency? Thanks -Shehjar