From: "fibreraid@gmail.com" Subject: Re: Streaming perf problem on 10g Date: Wed, 3 Nov 2010 11:47:37 -0700 Message-ID: References: <766909857.700951.1288807081999.JavaMail.root@mb2> <4CD1AAE2.3020003@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Cc: Shehjar Tikoo , linux-nfs@vger.kernel.org To: Joe Landman Return-path: Received: from mail-ww0-f44.google.com ([74.125.82.44]:65014 "EHLO mail-ww0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752743Ab0KCSrj convert rfc822-to-8bit (ORCPT ); Wed, 3 Nov 2010 14:47:39 -0400 Received: by wwe15 with SMTP id 15so999840wwe.1 for ; Wed, 03 Nov 2010 11:47:38 -0700 (PDT) In-Reply-To: <4CD1AAE2.3020003@gmail.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: Hi Shehjar, Can you provide the exact dd command you are running both locally and for the NFS mount? -Tommy On Wed, Nov 3, 2010 at 11:33 AM, Joe Landman wr= ote: > On 11/03/2010 01:58 PM, Shehjar Tikoo wrote: >> >> 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 fil= e in >> 64k blocks. >> > > If the size of this file is comparable to or smaller than the client = or > server ram, this number is meaningless. > >> The network is performing fine with many Gbps of iperf throughput. >> > > GbE gets you 1 Gbps. =A010GbE may get you from 3-10 Gbps, depending u= pon many > things. =A0What are =A0your numbers? > >> Yet, the dd write performance over the nfs mount point ranges from 9= 6-105 >> Mbps for a 6gb file in 64k blocks. >> > > Sounds like you are writing over the gigabit, and not the 10GbE inter= face. > >> I've tried changing the tcp_slot_table_entries and the wsize but the= re is >> negligible gain from these. >> >> Does it sound like a client side inefficiency? >> > > Nope. > > -- > Joseph Landman, Ph.D > Founder and CEO > Scalable Informatics Inc. > email: landman-nyOC7EYE20mM0MU9lROt9DlRY1/6cnIP@public.gmane.org > web : http://scalableinformatics.com > phone: +1 734 786 8423 x121 > fax : +1 866 888 3112 > cell : +1 734 612 4615 > -- > To unsubscribe from this list: send the line "unsubscribe linux-nfs" = in > the body of a message to majordomo@vger.kernel.org > More majordomo info at =A0http://vger.kernel.org/majordomo-info.html >